well...screenshots of the windows error message won't help me...it would help me to tell me *where*/*when* it happens...
Right click and delete mess files? right click where? profiler? scanner?
I will do some research this evening...but if you can provide the files somewhere, that would be great...
"randomly" of course doesn't sound that good....maybe a not initialized variable...don't know...need to repeat it...then the debugger will catch it....
I've done several scans with and without rebuilder and never had that error....so it's not that common
So...a full dump of your folder would be a start...plus instructions how to repeat it...
...or maybe it only happens when scanning zip files....or only rar ... or only 7z files....? Try to minimize the scope...
...and of course turn off virusscanners...