The latest AVG update decided that user32.dll was malicious so it deleted it. Guess what the machine don’t boot no more
Details here FAQ 1574 and 1575 http://www.avg.com/support
Definately the way to impress your user base
A very big oops.
You’re in trouble if you can’t startup to view that FAQ entry though or have a second system to save your a**.
And their forums are worthless, so no help there.
I just checked their forums. There’s a bunch of unhappy campers there.
It’s nice of them to post a fix which if you can’t boot your system, you’ll never see. 
Yes, but the instuctions are nice and clear, easy to follow.