I have recently upgraded most of my computer, and it is now locking up when I run most programs. Its done this while playing WoW, Fallout 3, and simply being online with Firefox. Strangely enough, I haven't had any problems with Freelancer yet. Originally I had: Foxconn M7PMX-S mobo Intel P4 3.6gb (Don't remember the model) 2x1gb cosair ddr2 667 Radeon x1600 512mb hec ACE-580UB 580W psu 2 sata hdd's (250gb\640gb) dvdr drive ethernet card WInXP o\s I didn't have problems with the old build, but it was getting old. I got the new video card and put it in with no problems on the old build, and a week later replaced the rest of the parts. I now have: Gigabyte EP45T-UD3LR mobo Intel Core 2 Quad Q8300 2.5GH 2x1gb corsair ddr3 1333 Radeon 4850 1gb Same psu Same hdd's Same dvdr Same ethernet card Same o\s I didn't reinstall windows and everything else when i changed mobos, but this wasn't a problems for anything in the past. Just uninstalled old drivers, installed new ones. There shouldn't be any overheating issues either, both the bios and speedfan show it to idle in the 30c's, and under 50c while loaded. Nor did I change any clock timings or voltages in the bios, with either build. I've read about other people online putting together very similar pc's, and I don't see why this shouldn't also work. Is there not getting enough power? Should I really ininstall windows? Did I get bad parts maybe? Is there some kind of program to test to see what could be wrong? This whole thing has frustrated me and I would appreciate any help I can get at this point.