what is the diffent of 32bit and 64bit windows?

[hogo900]

is the 64bit windows better?

[jlreich]

The biggest difference is 64bit will support more than 4GB ram. 32bit will only be able to use up to ~3.5GB or less depending on your hardware configuration. If you have say two 1GB video cards you may end up with ~1.5GB of usable ram.

Also a 64bit OS will be able to fully use the 64bit capability of the todays 64bit CPU's. Though it is really only the OS since there really isn't but a few 64bit programs out there.

For XP generally stick to 32bit due to the fact that XP64 was kind of abandoned. I use it for my media server but it has a limited use so it seems to work just fine and I had an unused copy.

For vista or 7 I almost always recommend going with 64bit. Though it is definitely good to make sure any must have programs will work in 64bit versions before taking the plunge. This is particularly true for any proprietary legacy programs. Like database programs that your company wrote that hasn't been updated since the 80's. :p

[hogo900]

oh.think you .I don't sure I can use the 64bit windows.

[jlreich]

If you have a 64bit CPU you can. If you have an old s478 P4 or socket A AMD CPU then you can't and should be sticking with XP 32bit.