Hy!
It’s simple. I went to the Stat—>console–>programm uninstalls and i chose avast. It asked me, that i really want to delete this programm, i said yes. It asked again, and then it started to uninstall. Now, end of the process ( approx. 85 %) it is trying to start: aswrundll.exe AcsStopSoftvereUpdater, but it dosent do anything. I dont know what should I do.
After you have done what Asyn mentioned. Go to this website http://rejzor.wordpress.com/avast-cleanup-tool/ and scroll down a bit and you will see a Zip file called Avast Cleanup Tool. Click on that and download it. Run that tool in normal mode and restart manually. Once you have done that reinstall a fresh new copy of Avast and follow instructions. After that Avast will do a startup scan automatically. After it finishes the startup scan. Restart your computer again manually. After restart register your copy of Avast :).