I have been having a serious issue with my PC. The PC will boot up without incident, but if I try to access explorer or the OS, it will slow to a crawl and eventually freeze. I have encountered this with firefox, the start menu, and when trying to access the task manager. The problem is consistent, occuring everytime I start the machine. Usually within the first few minutes of a boot-up, Windows has frozen and I must force a hard reset. The only thing I can think of which may be the cause is a power outage which occured in the night. When I woke up, the PC was off and the problem began as soon as I booted up. The PC was plugged into a power strip which was not tripped by the outage. I can boot up in Safe Mode, which delays the onset of the crash, but doesn't stop it. I have tried using system restore by accessing the menu during start-up (F8) but the system restore always fails at the very end. Looking at the inside of the PC, there doesn't seem to be any visible damage (that I can detect) and at no points does anything seem to be giving off any excess heat. When I press CTRL+ALT+DEL in an attempt to access the task manager, the screen goes black and the cursor turns to a wheel. After several minutes, the wheel will stop and a prompt will appear stating "The logon process was unable to display security and logon options when CTRL+ALT+DELETE was pressed. If the operating system does not respond, press ESC or restart the computer by using the power switch." Any good guesses what could be the cause of all this? I haven't had much look scouring the web for answers.