Unfortunately this approach (F8-Last known good) doesn`t work for me.
I tried it many times - no success.
Isn`t there any other way to turn of the boot scan?
(Maybe change some configuration-file using the recovery-console or smth. like that).
Well, if you are able to access the disk (e.g. using recovery console), you can simply delete the
aswBoot.exe file in the WinNT\System32 folder and Windows should boot up normally.
(This whole thing is an avast! omission, but also a Windows bug actually; when the executable - that's scheduled to be started - doesn't exist at all, nothing happens: Windows start normally. When the executable does exist, but is somehow "wrong", the system bluescreens; there's a problem in Windows executable loader, I'd say).