I look at the lenovo site for driver updates. Many folk try the driver update button but that seems to fail here (and for me never helps.)
Try that first and then call Lenovo to report the bug.
Bob
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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