I experienced some BSODs during Windows Update (both when running it from control panel and when updates were installing during shutdown). These occurred on more than one update, but all related to Framework 4; some of them were KB2656351 and KB2487367.
My computer is running windows 7 SP 1 64 bit.
After uninstalling avast, those updates were able to install correctly; reinstalling avast! afterwards worked without problems.
Temporarily disabling all protections, instead, did not help.
Has anyone else encountered this?