I recently installed Ubuntu 12.10 to play around with Ruby. But after a couple of weeks, I can no longer boot into my Windows 7. It gives me a blue screen saying with error message "IRQL_NOT_LESS_OR_EQUAL". I can boot into windows in safe mode, and ubuntu is still fine.
One other anomaly. I can't shutdown ubuntu completely. It shows the ubuntu logo in the middle, and the computer stays on. After powering off manually a couple of times, I started not being able to boot into windows.
Any help is appreciated!