I have a windows 7 machine that I use as a 'server' for SageTV (playing DVDs) I dont dirrectly connect to it and the software is stable as far as I did install much software at build and I have changed little recently as far as software.. I recently swapped the CPU out for a quad core and added a little more memory. I got my first blue screen when I restarted after installing the cpu and memory. I thought it might have had something to with a USB expander card not being seated properly as that didnt seem to show up in the hardware list after reboot. Since I didnt really needed it removed it rather then to mess with it further. All was good, PC ran for at least a week straight but when I shut it down so I could shut off house power it blue-screened again on the restart. It blue-screened one other time on restart and today it bluescreened outside of the restart. Two dumpfiles are attached. PC Info Motherboard is Asus PSQ-EM Intel Q8400 (Quad Core) 2.66mhz 5 Gigs ram It seems to me the new CPU or memory would likely be the problem. I did take a look at the cpu temp and all the cores stay around 50c. If there is any more info I can provide I would be happy to.