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I have 2 GB RAM in my laptop. I want to install Window 7 Ultimate but I don't know which architecture to choose - 32 bit or 64 bit.

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closed as primarily opinion-based by Dave, Tog, Breakthrough, Garrett, Simon Sheehan Jun 21 '14 at 2:03

Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise.If this question can be reworded to fit the rules in the help center, please edit the question.

You choose 64bit. However, your question isn't a good fit here, since this is a Q and A site. Please do read the help section to find out what is on and off topic – Dave Jun 20 '14 at 4:59
The architecture which your computer supports. – abhishekkannojia Jun 20 '14 at 4:59

32-bit Windows versions support a limit of 4GB of RAM. Don't use the 32-bit version unless you are trying to avoid buying a new OS and think you'll never put more than 4GB of RAM in this system, or if you have software that will only work on a 32-bit system (such as old DOS programs that rely on NTVDM).

However, if your laptop has a 64-bit CPU, you'll get performance and security improvements, so install 64-bit Windows if your CPU supports it and you have no need to stay with 32-bit for compatibility reasons.

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What are the security improvements? No-eXecute is supported in 32-bit by using PAE. – Paul A. Clayton Jun 20 '14 at 12:17
The main one I'm thinking about is 64-bit Windows won't load unsigned device drivers and actively tries to prevent kernel modification, making it a bit more difficult for malware from loading unsigned drivers as an exploitation route. Not a hardware difference, just a software difference between 32-bit and 64-bit Windows editions. – LawrenceC Jun 20 '14 at 13:03

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