Changing Bit Size From 64bit To 32bit .

I hate to tell you this now that you got Windows 7 x64 working but you are not going to get much benefit from running a 64-bit system with only 3GB RAM. The main advantage of upgrading to a 64-bit system is to be able to use more than the 4GB limit in 32-bit Windows.


Most of the programs you can run in Windows 7 32-bit will run quite happily in Windows 64-bit but you will have to get new drivers for your printer / scanner / graphics card / etc. Most of these will be sorted out if you do a clean install as recommended by 'Bare Foot Kid'.


There are a few classic games like Black & White and Dungeon Siege which ran on Windows XP but are not that happy on Windows 7 even in XP compatibility mode but there are fixes (Google it) which make them very playable in Windows 7 32-bit or 64-bit.


As for your anti-virus, just go with what you are already happy with - they all work equally well on Windows 7 32-bit and 64-bit. I prefer AVAST! because there is a nice Lady that tells you that "Your Avast virus database has been updated" every morning when you get connected to the internet. This is probably not a major selling point, but I find it kinda nice to know that my internet connection is working because that is something that is not always guaranteed where I live.