I've been having this problem since I first built my PC 2 years ago, and I have tried several times to resolve it. Now I'm going to try again, and I really hope you guys can help me fix this once and for all. My PC: Vista Home Premium 32-Bit Intel e6600 @ 3.0 GHz nVidia 8800 GTS 320mb 2 x 320gb Western Digital Hard Drives 2 x 1gb G.Skill DDR2 RAM ASUS nForce 6 Motherboard Chkdsk shows no errors WD hard disk utility shows no errors Memtest86+ shows no errors I just cleaned my PC case out; it was dusty but not terrible because I'm pretty good at cleaning it semi-regularly Every piece of hardware is running the latest update/driver/BIOS/firmware I would post antivirus statistics, but that is the problem. I can't. My computer cannot run a virus scan without Blue Screening; in fact, it has never been able to do so. This also goes for spyware/malware scans. When any one of these searches begins scanning the registry, my computer will BSoD with PAGE_FAULT_IN_NONPAGED_AREA. I've also seen IRQL_NOT_LESS_OR_EQUAL but that is much less common. Only virus scans result in this BSoD. Other than for this reason, my PC has BSoD'd maybe once in total. Mind you, I can run Registry Fixes from CCleaner; those work fine. Only virus and malware scans cause this error, and it typically happens when the scan claims to be searching the registry. As far as I know, this problem has existed since the first day I ever tried to run a virus scan. I've tried to fix it numerous times, and heard the error be attributed to various causes. Bad memory? Memtest shows no errors Bad PSU? Well I have low 5v and 12v rail wattages, and I even RMA'd my PSU to fix this. Guess what? New PSU shows same values. I don't think it's the problem anyway. Bad Windows install? I hope not. I'm sick of not being able to run virus scans. Fun fact: Windows Explorer crashes whenever I type 'v' into the search bar; I think this is the result of a virus, but I've never heard of anything like it so I figure it's worth mentioning. Unfortunately I recently ran Disk Cleanup and cleared all my minidump files (I had hundreds of them.) If you guys would like more than 1, I can continue to run virus scans and generate them for as long as you please. Thanks in advance.