New
#11
Are you using the same ram from the previous sysytem? If I were you I would take a very close look at your ram as well. My experiences in the past with random reboots or freeze's with XP were ram related. Depending on your system certain ram can be extremely finicky to achieve stability. I used to have Crucial Ballistix and they were horrible, RMA'd, and no matter what I did I couldn't get the damn things to hold a stable system for more than a few days. Sometimes it would even pass a memtest one day and fail the next.
Even now, with my OCZ Reaper HPC's they are 100% rock solid BUT ONLY after I set a value for EVERY timing in the BIOS, having it on auto was no good for these sticks.
My suggestion run memtest86+ overnight! Let it run through 10-15 cycles of tests. If in the morning it still shows running and no errors, well at least you've ruled out the ram!
http://www.memtest.org/#downiso