Boot time problems.

I am having a big problem with the Boot time scan. Cannot do it. Got the start screen and the error message: "Unhandled expection…and the log in screen is back. I did few scans at the last week and the program found nothing. Yesterday I installed again the 4 and it is found 3 different Trojans in VMWare Windows XP…I deleted but the boot time scan doesn’t goes straight. The other problem is some strange message on the Avast start…When I say: don’t show this message new error message coming up: The program don]t support this method…Is here any help to solve this problem?
Thank you all!

Alwil acknowledges the boot time scanning bug (http://forum.avast.com/index.php?topic=29999.msg247134#msg247134). You’ll need to wait for the next program update.