Originally Posted by adelhamdan
which is best for my A64? a 64 or 32 bits installation? I am asking this with regards to compatibilities of drivers etc...
Depending on what you want to do. If you just want to use it for typical desktop stuff, like web browsing, multimedia, etc, go for 32-bit. It's just easier to set up - not as many problems as with 64-bit.
If you need to have a server on that PC, or if you perform lots of heavy calculations (like image and movie rendering) it may be useful to set up a 64-bit machine.
Read the review of Kubuntu on Athlon 64
to see how many problems you will have with a 64-bit machine (and Ubuntu makes it pretty easy anyways!)