My wife has a lenovo U330 ideapad, about a year old. It runs Windows Vista, 2 GHz, 2 GB RAM. A few months ago it started crashing--BSOD reporting "Page fault in nonpaged area" and referring to bisonc07.sys. I looked up the filename and learned that it's a webcam driver, presumably for the built-in webcam.
I couldn't figure out how to uninstall it (it's not listed in Device Manager) so I disabled the camera with <Fn> - <Esc>. That decreased the crashes significantly, but didn't completely solve the problem and requires repeating during every startup. Next, I tried renaming all bisonc07 files, but that did not help. The BSOD messages are still the same.
How can a file that no longer exists be causing these crashes? Is there a registry entry that I need to remove?
Thanks in advance. I should also mention that I have scanned the computer with Symantec and Malwarebytes and the system is clean.
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