system
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Thanks for your help, but I dont look for that much help.
All I want is understand where Avast might put information about what it found, cause I cannot find any even after a quite intense search.
EDIT:
Problem is solved, thanks. Also I think I had to try 10 times to get the captcha for this post right. Damn is this annoying.
I found the logs, turns out the “rootkit” was nothing more than a copy protection driver I know. It’s definitely a stupid piece of software, but it is not a rootkit at all. 
Avast really should consider to show the fully patch of the results found in the warning message so it is easier to tell what is happening. If I had seen the whole patch I would have known. Now I wasted 4 hours and killed a piece of game-install of mine.