It seems like the problem has been fixed. Chrome didn't open up automatically for 12+ hours now.
I have found some remaining files on the computer, that were related (had similar names) to the infected .exe file that i ran originally, which caused this whole thing. So i manually deleted those. It was an empty folder and some .lnk files. (.LNK)
I did a long full scan with ZoneAlarm Free Antivirus yesterday, it found malware, but i think those were unrelated to my problem, since they were older files.
I also ran a full scan with Eset Online Scanner, it found some malware on my