Mem
Lifer
It's cause XP is a pile of crap.. one of the worst OS's ever.. sounds like a slight instability to me
It`s very easy to blame the OS when you don`t know what the problem is,btw using XP PRO here and and it`s rock solid,best OS by Microsoft so far IMHO . Compddd you don`t say what PSU or wattage you`re using?
I would go back to minimal hardware setup and clean install of OS and install the other hardware and software one at a time and see how it goes.
🙂