My neighbor gave me a Dell Inspiron 531 computer he had found and it did not have a HD. I put in a HD and loaded Linux and it works perfectly. It has a Vista COA attached. It has an AMD™ Athlon™ 64 X2 dual-core processor 4000+. Is this a 64 bit processor? I want to get an OS for it and would like to try Windows 7. Since it has Linux, I am unable to run the Windows 7 comparability application. Any thoughts would be appreciated.