their is a known issue which causes memory leaks.
had it through 2 installations and after llooking around on planetamd64 i found im far from alone.
another fellow who had the same problem said he found out it was .net framework not working asit should.
almost everyone over at planetamd64 claimed it was lack of memory and that xp64 demans 2gb memory to run smooth but thats just BS
also the support is horrible.
logitech doesnt support my mouse mx510
leadtek didnt support my tv-card
the ethernet drivers from nvidia didnt work as good as they should, had drops in downloadspeed.
also the gfx card drivers wasnt top notch which they was on xp32.
i went back to xp32 due to all the problems their was no solution too