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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323
votes
18answers
157k 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 ...
189
votes
19answers
39k 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 64-...
159
votes
11answers
91k 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 "necessary"...
135
votes
16answers
91k 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?
97
votes
9answers
350k views

Kill a process which says “Access denied”

I have a process that I can't kill with either Task Manager or Process Explorer - I get the error "Access denied". The process isn't a Windows executable. How can I kill it? Is there some tool I ...
90
votes
11answers
126k 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 ...
87
votes
9answers
59k 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 ++. ...
67
votes
8answers
224k 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 doesn'...
55
votes
3answers
6k 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 ...
52
votes
0answers
10k 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 ...
42
votes
10answers
118k 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 ...
40
votes
1answer
3k 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?
39
votes
10answers
3k 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 ...
38
votes
6answers
35k views

How to get SVG thumbnails in Windows Explorer?

I can open them in browser just OK, but how can I have thumbnails in the Windows Explorer? Edit: I installed Renesis Player as suggested by this answer, but it does not work for me, probably because ...
35
votes
5answers
146k 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: <...
35
votes
3answers
184k views

How can I open the 32-bit ODBC Data Source Administrator in Windows 7 64-bit?

I want to add 32-bit data sources. There seems to be no obvious way to see existing instances of these or create new ones. How can I open the 32-bit "ODBC Data Source Administrator" window in Windows ...
35
votes
7answers
10k 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 clearly-...
34
votes
8answers
23k views

Is there any benefit from installing Windows 7 64-bit when you have less than 4GB of 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 ...
33
votes
6answers
34k views

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

Why is it that: a 32-bit OS, when installed on a 64-bit CPU, can run old 16-bit applications, but if you install a 64-bit OS it can't run those applications directly and need some sort of emulation ...
30
votes
2answers
15k 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 ...
29
votes
7answers
10k 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 ...
28
votes
6answers
4k views

How do you determine that your hardware is 64 bit capable when there is no operating system installed?

How do you determine that your hardware is 64 bit capable when there is no operating system installed?
28
votes
7answers
55k views

Terminal emulator with split panes for Windows 7 (64 bit)

I'm looking for a terminal emulator on Windows 7 (64 bit) with a specific feature: to be able to split the command prompt window into multiple panes. It's a great feature of Terminator for gnome, I ...
25
votes
9answers
68k 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" (...
25
votes
2answers
30k 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 ...
23
votes
6answers
16k 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 (...
23
votes
3answers
12k views

How do you register the 7-Zip GUI program with the .7z extension in Windows?

For whatever reason, the 64-bit Windows Installer doesn't seem to register the .7z file extension with the 7-Zip GUI (or with anything, as far as I can tell). How do I go about doing it. A simple "...
23
votes
6answers
77k views

Uninstalling programs silently via CMD

Is there a way I can uninstall programs without the graphical interface and doing it via CMD?
21
votes
2answers
10k 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 ...
20
votes
3answers
38k views

Difference between ia64 and x64

What is the difference between ia64 and x64?
20
votes
2answers
1k views

How do I see if a process is running in 32-bit or 64-bit mode in the Windows 8/10 Task Manager?

Previously, I would look in Task Manager for a *32 next to the process name in Task Manager to tell what platform the process is running on: However, in Windows 8 and 10 (on the details tab) this ...
19
votes
7answers
134k views

How do I clean up COM ports in use?

How do I clean-up these in-use COM ports? The COM port numbers always seem to be taken up by something and although right now I only have 4 serial ports (3 over Bluetooth and one USB to RS-232), I ...
19
votes
4answers
2k 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
3answers
31k 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 ...
19
votes
2answers
151k 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?
18
votes
5answers
212k views

How to check whether my hardware is 64-bit capable in Windows?

My OS is 32-bit but I want to know if my hardware support 64-bit
18
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?
18
votes
1answer
32k views

Can Windows Virtual PC run a 64-bit OS?

I'm running Windows Virtual PC (RC) on a Windows 7 (RTM) 64-bit host. When I create a new virtual machine and try to install 64-bit Windows 7 on that VM, I get "this CPU is not compatible with 64-bit ...
18
votes
3answers
28k views

Per-application audio control that works in Windows 7 64 Bit

Added: Last item that I could not gain (per-app) control of is "System Sounds" I do not know what executable or window to "talk to" to control this item. On Windows 7, I'm still looking for a per-...
17
votes
7answers
13k views

Computer doesn't use more than 4 of my 8GB of RAM…? (64-bit computer)

Recently, to future-proof my computer, I've added on top of my original 4GB of memory. I brought the total memory to 8GB, and I've got no noticeable change in speed-- even when it should. I went to ...
17
votes
8answers
139k 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 ...
17
votes
4answers
77k 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?
17
votes
3answers
65k views

How does one manually restart graphics drivers?

I'm suffering from the dreaded Radeon mouse cursor corruption. The problem is intermittent and can be "solved" by putting the computer to sleep or restarting it. I hope simply restarting the graphics ...
17
votes
3answers
509 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
4answers
32k 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 ...
17
votes
6answers
71k views

What is a UFR II printer driver and why might I use it in preference to another type?

A new printer recently showed up at work. There are an abundance of possible drivers for it applicable to my system (Windows 7, 64 bit) including PCL5, PCL5e, PCL6 and UFR II. I'm familiar with PCL, ...
17
votes
2answers
3k 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
3answers
182k views

Where can I download a legitimate Windows 8 ISO image? [duplicate]

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 ...
16
votes
2answers
15k 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 "...
16
votes
5answers
9k views

Bare-metal virtualisation for the desktop

What knowledge exists about bare-metal virtualisation products? I'm interested in building a new desktop machine for home. I've been looking at the Intel Quad Core processors and I'd like to put 8 GB ...