Hey daledoc, thank you very much for this detailed answer. To answer your question: I just deinstalled it for the purpose of scanning without any problems and reinstalled it right after it didnt work out :/. I just gave both, Avira and Malwarebytes the permissions for each other, although I didn't do this on my laptop, where everything works and either Avira and Mbam are installed. This time mbam scanned 1500 objects, but then again told me the scan was a success and no viruses were found on my system likeit did the last times. I'm now going to check if my HDD has some corrupted sectors, otherwise i'll reinstall Windows 7, and/or format it, because i really got the impression somethings wrong on my PC, I think that someone hacked our network or i've got a keylogger onboard *g*. Well it's not that funny though.. As soon as I found out something new I will post it, just hope this thread helps someone else with a similar problem.