re: XP-64 bit is problematic.
My new machine had XP-64 installed on it, but after some research, I found that Microsoft was, shall we say, being "less than supportive" of this operating system, and concentrating on Vista 64.
I bit the bullet, and installed Vista 64, which seems to work well on the two main programs I have that operate as 64-bit applications. I'm still running a lot of stuff on my old XP-32 system, too.
I can even run one of my good old clicky PC-AT keyboards on it!
