Best answer as chosen by user RWutch: Re: upgrade
An upgrade from a 32-bit XP to a 64 bit 8 is not possible. The upgrade program sees you have a 32-bit OS and downloads a new 32 bits also.
So your choice:
- upgrade to 32 bit Windows 8
- buy a retail 64 bit Windows 8
Buy the way, a 64-bit Is doesn't have much (if any) advantages on a PC with 4 GB or less of memory. And 32 bits Windows XP machines don't have more than 4 GB. So it's somewhat doubtful if you profit from it without buying additional memory. And - if you do that - it depends on what you do with your PC if you'll notice any performance difference between 4 GB and 8 GB of RAM.