I have a fairly new desktop running XP-Pro SP2, and after the computer has been on for 15 to 30 minutes I get a blue error screen with the message "driver_irql_not_less_or_equal". This message also comes with the message "iastor.sys - address B9D5D25F base at B9D4E000". The error occurs whether or not I am running anything.
I have tried the following:
Using system restore to a point before this problem occurred. (no effect)
All devices other than mouse and keyboard have been removed (no effect)
Plugging the mouse and keyboard into different USB Ports (no effect)
Swapping out one at a time each of the four memory sticks (no effect)
Running ChkDsk /f on start-up (it crashes before finishing)
I also tried to reinstall windows and ran into the following problems:
If I run the windows setup after booting it says that I cannot since the CD that came with the computer is SP1 and I have SP2. When I boot off of the CD the computer freezes when it reachs the first set-up screen (where you can choose to repair or reinstall) and I cannot proceed.
I am running out of things to try. I am not quite ready to rebuild from scratch, especially without knowing what is wrong. Any suggestions?