Windows 7 with full 64-bit support
Microsoft’s upcoming Windows 7 64-bit version runs beautifully with 4GB of RAM, enabling you to manage tons of applications with zero slowdown. It also makes your system more futureproof, allowing you to take your system to 8GB, 32GB or even a terabyte, before too long.
However, hardware is the biggest issue. You cannot work with your 64-bit OS, if a gadget doesn't have 64-bit drivers, as 32-bit drivers aren't supported.
There are some software problems too. For example, sometimes Google's Chrome may not operate efficiently with Windows 7 64-bit. Although Adobe Flash doesn't run with 64-bit browsers, it can be operated with the regular 32-bit browser.
Using a 64 bit OS for a 64 bit processer can address far more than 4GB of memory, which is suitable for avid gamers, CAD, video editors and huge multi-taskers. While any 32 bit software will still be restricted to 4GB memory, a 64 bit CPU, OS and applications will take full advantage of the additional RAM.
However, if you possess a 64 bit capable CPU but use older hardware, then staying with a 32 bit version for the time being will be safer to ensure that you don’t require extra upgrades.
But if you have the latest hardware and drivers, it may be beneficial to step up to a 64 bit OS. For a user working regularly with 64 bit optimised resource hungry applications – like video editing, CAD and image packages - it would be especially advantageous to be able to work with more than 4GB of RAM along with the other improvements.
64-bit computing will soon be a common standard, as all hardware from the last couple of years has been customized accordingly. However, there is still a strong case for some users to stick with 32 bit Windows for the time being until a complete upgrade cycle has passed for the majority of users.