I can only install and play COD4.
I can't install Crysis or Command and Conquer 3 + its expansion pack.
Annoyed as I bought the extra RAM for 64-Bit and to make them run faster.
Can anyone point out anything I could do to be able to install these games or is there no hope?

Aside from the IE running in 32 due to lack of 64 bit Active X controls

All other programs will run in 64 bit mode on a Vista 64 bit install

you could either use dual boot with XP
or dual boot with 32 bit Vista as a second OS option

will be awhile before games come out in 64 bit on the PC

expect it in about 1-2 years as XP heads for abandoned OS status