Windows XP....34 Bit or 64 Bit????

[lili]

Hello:

In trying to download the patch for a virus, I had to
decide between 2 versions of the patch:

1) Windows XP 34 Bit
2) Windows XP 64 Bit

I cannot figure out which OS I have, though I have looked
everywhere from Systems Information to run: winver, etc.

Anyhelp would be great! Or you can email me with the
answer to

Thanks!