Help! ashUInt.dll Error

When I try to start avast antivirus, after checking the memory, it gives me the error 'The entry point - USiBrowseFor FoldersA@16 could not be located in the dynamic link library ashUInt.dll. ’

In addition, it keeps telling me that avast needs me to restart my computer, asking if I would like to do so. It asks me this even right after I restart my computer.

I’ve seen posts with similar problems but didn’t find a solution.
Please help and/or direct me to another post that can solve this. I tried to use the 'repair program option, which did something but did not correct the problem.

thanks
david

Try to search your harddisk for ashUInt.dll file - are there more occurences than the one inside avast! installation folder?