I ran Spybot. He didn’t detect the infected files. Instead of that he found some spyware cookies and registeries that has been installed when trying to access pay-sites. I removed them.

The scan of Spybot is very fast, compared to an antivirus scan. It seems for me a little bit too fast (95 seconds for 10 Gigabytes data). Does he really scan all the files from the harddisk ? I have put an infected file in the move folder of Avast, but how can I be sure that he scanned this file ?