Hello, This is my 1st time here and as you could guess I am in trouble. running windows XP pro and my system was getting a bit slow so i ran a clean up "auslogic" then ran "bugdoctor" and the system crashed. When I re booted it gets to the point of loading windows with the blue bar creeping across then it dissapears and all i have is a black screen no curser no nothing. just sits there. Re booted, changed the the boot disk priority in the bios set up to the cd drive and booted from my windows cd (hoping to do a repair) and it tries to load, takes a long time and I get a blue screen as follows: A problem has been detected and windows has been shut down to prevent amage to your computer. If this is the first time you've seen this stop error screen, restart your computer. If this screen appears again, follow these step: check to be sure you have adequate disk space. If a driver is identified in the stop message, disable the driver or ckeck with the manufacturer for driver updates.Try changing video adapters. check with your hardware vendor for any BIOS updates. Disable BIOS memory options such as caching or shadowing. If you need to use safe mode to remove or disable components, restart your computer, press F8 to select Advanced startup options, and then select safe mode. Technical infomation; *** stop : 0X0000007E (oXc0000005, oxF78360BF, oXFC82208, oXf7c81F08) *** pci.sys - Address F78360BF, base at F782F000, Datestamp 3b7d855c Been doing a little research and this seems quite common. I think I have a registry problem. Clean up deleted something it shouldnt have (or rather I did). Some research suggests downloading a "registry fix". Problem is My PC wont go any further than the blue screen. Cant fix anything if it wont boot up. Mashed F8 and tried all the safe mode boots and no luck. Am I screwed? Any help would be most appreciated. Thanks.