You can run Windows 7 64bit on that machine. 64 bit doesn't require 4 gigs of ram to be used, it simply allows you to see more than 3 gigs of ram. As well as some other software differences which I couldn't explain off the top of my head
You can run Windows 7 64bit on that machine. 64 bit doesn't require 4 gigs of ram to be used, it simply allows you to see more than 3 gigs of ram. As well as some other software differences which I couldn't explain off the top of my head