Hi, I'm having a lot of trouble with my computer since yesterday. It restarts itself every few minuts. I get a blue screen with PAGE_FAULT_IN_NONPAGED_AREA. Error code is 0x00000050, the other parametrs are different every time. fffffbf8 appears most often i think. I would say that this happens randomly, but I noticed that it happens always when i try to run regedit or do a search in windows explorer. I don't have any new drivers installed recently. Last thing i installed was a usb scanner but that was more then a week ago. I checked some things that were recommended on microsoft.com. - It could be caused by variant of the Sdbot virus (http://support.microsoft.com/kb/897079/en-us) First i checked for files: msdirectx.sys, haxdrv.sys, msdrv.exe, sdkcore.exe and didn't found them. I also checked drive c with Microsoft Malicous Software removal tool, but it says that system is clear. - It could be caused by rootkit spyware programs: Msupd5.exe, Reloadmedude.exe. I followed steps in this article http://support.microsoft.com/kb/894278/en-us and also didn't fount anything. Eventho i had nod32 antivirus i installed Windows Defender, which didn't found anything too. I don't know what to do next. Please help me. If you need to know more detail bout a hardware i have tell me what should i write. I will be gratefull for any sugestions.