64-bit refers to processors that have a word length (the fundamental data type of registers and memory transfer operations) of 64 bits, allowing each word to hold 2^64 = 1.845 x 10^19 discrete values (over 4 billion times as much as a conventional 32-bit word).

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286
votes
18answers
101k views

If 32-bit machines can only handle numbers up to 2^32, why can I write 1000000000000 (trillion) without my machine crashing?

32 bit computers can only store signed integers up to 232 - 1. This is why we have run out of ipv4 addresses and have entered the 64 bit era. However, the number 232 - 1 (2,147,483,647) is not as ...
142
votes
19answers
24k views

32-bit vs. 64-bit systems

What are the differences between 32-bit and 64-bit systems? If you have used both of them, what kind of sharp differences have you experienced? Would it be a problem to use 32-bit programs on ...
120
votes
9answers
62k views

Why does 64-bit Windows need a separate “Program Files (x86)” folder?

I know that on a 64-bit version of Windows the "Program Files" folder is for 64-bit programs and the "Program Files (x86)" folder is for 32-bit programs, but why is this even necessary? By ...
59
votes
10answers
72k views

Quick way to tell if an installed application is 64-bit or 32-bit

I've got a third-party application (in this case Cognos Data Manager) installed on 64-bit Windows Server 2003. Is there a quick way to determine if an application has been built/compiled as a 64-bit ...
52
votes
0answers
8k views

32 vs 64 bits… what's the big deal?

Why is it considered to be such a big deal to have a 64-bit computer? Why does it "change everything?" Why do applications need to be designed differently between 32- and 64-bit platforms? And, on ...
51
votes
3answers
4k views

Why is the 64-bit version of Windows bigger than the 32-bit version?

The difference in size for the Windows 8 Consumer Preview ISO images, between the 64 bit and the 32 versions is 800 Mb or a difference of 24%. I've never seen a difference so large. Why is there ...
50
votes
9answers
33k views

ShellExecute failed (2) error for Notepad++ on Windows 7 64bit

ShellExecute failed (2): Is this command correct? "C:\Program Files (x86)\Notepad++\notepad++.exe [location of file to edit] I seem to have some issue with RIGHT CLICK > Edit with Notepad ++. ...
43
votes
9answers
134k views

Kill a Process which gives access denied

Sometimes I need to kill a process which is giving me "Access denied" when trying to use the task manager or Process Explorer to kill. I am using Windows 7 64bit. I need to be able to kill such a ...
36
votes
10answers
2k views

Should I install 64-bit versions of operating systems?

With the release of Windows 7 coming up, 64-bit operating systems have caught my attention. What are the main advantages and disadvantages of installing 64-bit Windows 7? What type of compatibility ...
36
votes
1answer
2k views

Do 64bit software/applications require more RAM than their 32bit counterparts?

I just saw these minimum requirements for a game: Memory: 2GB for 32-bit OS or 4GB for 64-bit OS Why does the 64bit OS require more RAM than its 32bit counterpart?
35
votes
3answers
3k views

What is the difference between “Program Files” and “Program Files X86”?

In Windows 7 there are two folders, "Program Files" and "Program Files X86". What is difference between them? Where does a 64 Bit program get installed?
32
votes
7answers
7k views

Other benefits of 64-bit OS apart from memory expansion?

I'm trying to convince somebody of the benefits of switching to a 64-bit OS but I'm having a hard time finding arguments other than "you can use more than 3GB RAM". Are there any other ...
30
votes
5answers
24k views

How to check if a binary is 32 or 64 bit on Windows?

So, I need to do just that before I move the program to 32bit machine and experience a spectacular failure. Is there an easy way to do this?
29
votes
8answers
15k views

Is there any benefit from installing Windows 7 64-bit when you have less than 4GB or RAM?

I've recently purchased Windows 7 Ultimate. I have an AMD Athlon64 X2 5000+ with 2GB DDR2 RAM. I know RAM has gotten much cheaper, I know, I know, but I am not going to be able to upgrade my RAM for ...
28
votes
5answers
22k views

Why can't a 64 bit OS run a 16 bit application?

Why is it that a 32 bit OS which is installed on a 64 bit CPU can run old DOS 16 bit applications, but if you install a 64 bit OS it can't run those applications directly and need some sort of ...
26
votes
7answers
6k views

How important is having 64-bit programs on 64-bit OS?

I recently upgraded to 64-bit OS(Windows 7) from my old 32-bit version. I noticed that while several applications are available in 64-bit(e.g. DC client, Tortoise SVN, Graphics driver), many are still ...
25
votes
9answers
62k views

How to open a file for editing in Administrator mode?

I have .config files set to open in Notepad++. The files I edit are typically in protected locations (e.g. c:\windows\, c:\program files..., etc..) thus requiring administrator access. I'd like to ...
23
votes
2answers
28k views

Running Java7 in Chrome for Mac OS X (requires 64bit?

My home banking system requires Java for logging onto the bank - see https://www.nemid.nu/ for a description of the system (in Danish only). This worked fine in Chrome under Mac OS X until recently ...
22
votes
6answers
10k views

Is it possible to run an old 16-bit DOS application under Windows 7 64-bit? [duplicate]

Possible Duplicate: Why 64 bit OS can't run a 16 bit application? How do I get 16-bit programs to work on a 64-bit Windows? Here at work my new development machine is Windows 7 64-bit ...
22
votes
2answers
7k views

How to run a minimal Linux inside a running 64-bit Windows 7

On my previous Windows Vista laptop, I used to run Portable Ubuntu Remix for Windows, which is based on coLinux, like the similar andLinux. This worked fairly well with limited system resources (a ...
21
votes
9answers
48k views

How to disable jusched.exe on Windows 7 64-bit?

I have recently purchased a new laptop from an OEM with Windows 7 64-bit. This system came pre-installed with (among other stuff) the Java Runtime Environment (64bit). This has put the "jusched.exe" ...
20
votes
4answers
60k views

How to reinstall GRUB2 EFI?

After successfully updating my bios, something went wrong and I ended up with a blinking cursor on the top left corner of a black screen. No errors, no nothing. The bios now only listed a SATA: ...
19
votes
4answers
1k views

Do I need to run defrag on an SSD? [duplicate]

Possible Duplicate: Do SSDs suffer from fragmentation? Is there an advantage to it? I mean, SSD is essentially random access memory.
19
votes
2answers
6k views

How to tell if linux process is 64bit

Given the pid of a process that's running on a x64 linux, how do I tell if it's running a 32 or 64 bit binary? I can look at the binary it's running out of 'ps' and do a file on that but I was ...
19
votes
2answers
149k views

Where do I download Java development binaries (JDK) for Windows 7 64-bit?

I am trying to install a Java development environment on Windows 7 64-bit, but I am unable to find a suitable install. Is there one available?
19
votes
5answers
35k views

Why Virtual Box won't give me option to create 64 bits guests?

My host is x64 bits Windows 8.1. I downloaded the latest Virtual Box (4.3) and I'm trying to create a VM with a 64 bits Ubuntu OS (ubuntu-12.04.3-desktop-amd64). When I go to New VM wizard, it ...
17
votes
3answers
501 views

Is there a significant limitation on useable software on a 64-bit Windows machine?

I have a 32-bit laptop that I've had for like two years. I'm getting a new one now, and I'm now noticing that lots of laptops come with Windows 7 64-bit. I've always heard that it's harder to find ...
17
votes
2answers
2k views

Desktop applications are unable to launch my browser in Windows 8

I have a fresh copy of Windows 8 Pro installed from MSDN. I have Google Chrome installed (stable channel) and it is set as my default browser. I even went into Control Panel > Default Programs to ...
16
votes
8answers
1k views

Should I choose 32 or 64 bit for Linux?

I own a Linux workstation which currently has 4 GB of RAM and planning to go for 8 GB in the near future. CPU is a Core2Quad Q9550. Should I install a 32 or 64 bit variant of Linux?
16
votes
2answers
24k views

Can I change the PATH environmental variable in Windows 7 without restarting?

Is there anyway to change the PATH environment variable (or variables in general) on Windows 7 Exterprise (64 bit) and have it take effect in PowerShell or the command prompt (cmd.exe) without ...
16
votes
2answers
14k views

Windows 7 x64 Pro not indexing PDF content?

In an attemp to get rid of all the paper clutter that I receive each day, I started scanning and ORCing all my important documents last year. I was using Windows Desktop Search on Vista to index my ...
15
votes
4answers
19k views

How do I capture a video of my Windows 7 desktop in VLC?

I used to be able to capture a video of my desktop in Windows 7 in an older version of VLC. But they've recently changed the UI and I can't seem to work out now how to record my desktop in the latest ...
14
votes
2answers
270 views

Are 64-bit processors “faster” than 32-bit ones, simply because they are 64-bits? [duplicate]

I have pondered that some say "32-bit is old news" because you are limited in RAM without cutting around, such as with PAE. Assuming first that the following factors weigh in on the processor's speed ...
13
votes
6answers
4k views

Windows XP: 4GB to 16GB RAM upgrade

I'm on a 32 bit OS Windows XP Home–will be upgrading to a 64 bit XP Pro–and I'm upgrading my RAM to 16GB. Should I see a difference? I typically compress a ton of files at one time. The 32 bit @ 4GB ...
13
votes
8answers
87k views

Why is all my extra RAM marked as “hardware reserved” in Windows 7?

I have a new HP Z800 Workstation, running Windows 7 Enterprise 64 bit. Z800 Specs are here. The machine has 4GB of RAM -- windows reported 1.99GB available, 2GB was "hardware reserved". I added ...
13
votes
4answers
2k views

Why do most Windows 7 laptops come with the 64 bit version?

It seems increasingly popular for laptop manufacturers to preinstall the 64 bit version of Windows 7 on laptops. Whilst there are well understood benefits of 64 bit OS over 32 bit, how much of that is ...
13
votes
2answers
2k views

Mah Jonng game on Archive.org from 1991 will not run

I am trying to download v3.5.1 on archive.org of Mah Jonng. I have no idea what is wrong with it but here is the error when I try to run it: Okay, this game is from 1991 and maybe it will not run ...
13
votes
3answers
23k views

Can a 32 bit OS run in a 64 bit processor?

What's the difference between 32 bit OS and 64 bit OS? Can a 32 bit OS run in a 64 bit processor?
13
votes
4answers
31k views

Huh? JDK not found? (on Windows 7 64-bit)

I am setting up a development environment for the latest Android 2.3 on a fresh install of Windows 7 64-bit. I first installed the 64-bit JDK 6 (jdk-6u23-windows-x64.exe). Then, I installed 64-bit ...
13
votes
1answer
9k views

ubuntu: amd64 vs i386?

cant understand what these are even though i've read articles about them. does it has something to do with 32 bits and 64 bits CPU? so why is it saying "AMD"64 and "I386"? AMD is a label just like ...
13
votes
4answers
20k views

How do I know my laptop is 64-bit compatible?

I recently plan to buy a new laptop to run a 64-bit OS, but a friend told me that my current laptop is already 64-bit. How can I verify if my laptop is ready to load a 64-bit OS or not? Here is the ...
12
votes
3answers
136k views

Where can I download a legitimate Windows 8 ISO image?

I bought a product key for Windows 8 a while ago, but I never got around to using it, because I can't seem to find a 64-bit Windows 8 ISO image anywhere. My processor is 64-bit, but my current ...
12
votes
6answers
3k views

What is the difference between 64-bit and 32-bit Operating systems? [duplicate]

Possible Duplicate: 32-bit vs. 64-bit systems I know that there are 2 types of OSs, 64 bit and 32 bit What is the main differences between them? And if I am buying a new laptop, which one ...
12
votes
3answers
12k views

Is my install 32 or 64bit?

I'm trying to find out if my Ubuntu install is 32 or 64bit. The best I can find is "i686" does this mean its 32 bit? Whats the correct way of finding out if the Ubuntu installed on my laptop is 32 ...
12
votes
9answers
7k views

Too much memory getting used

I have been feeling this way for a while, looking at task manager mentally ballparking how much physical memory should be in use, and noticing a large disparity. I finally got around to measuring it. ...
12
votes
3answers
26k views

Upgrade Ubuntu from 32 to 64 bit edition

Is there a way to upgrade my 32-bit version of Ubuntu to 64-bit version? I use Ubuntu 9.10. If there is no simple way, what if I simply copy my home and /etc directories to new installation, will it ...
12
votes
1answer
12k views

How can I run a 32-bit app on 64-bit OSX 10.7.2?

I have an app that only exists a 32bit version. In order to use it, I used to press 2 & 3 together before booting the Mac, so it'll run in 32bit mode. However, some apps (64bit version that ...
12
votes
2answers
2k views

Package managers for Windows [closed]

You might be familiar with Ninite. What I'd like to know is if there are good alternatives to that software for Windows. The features I expect: installs the latest version of software supports 64 ...
12
votes
1answer
11k views

Is my Windows 7 x86 license key valid for a x64 installation of Windows? [duplicate]

Possible Duplicate: When reinstalling Windows 7, does the language, version, architecture (64-bit or 32-bit) or source (OEM, retail, or MSDN) matter? I've just got a new laptop with Windows ...
11
votes
8answers
2k views

Pros and cons of 64bit vs 32bit Windows

What are the advantages and disadvantages of the two types of system? I know that 64bit allows more RAM then the 3-and-a-bit used by 32bit, but what other differences would you expect to see? I am ...