Hi Jasper -
This is avast! - Are you able to download and run this http://www.avast.com/en-no/uninstall-utility
If not Avast causing the problem, it "may be" a zero access infection
So please Fully Read Preparation Guide starting at Step #6.
NOTE : If you cannot complete any step, then skip it and still post the topic and leave a full description of your problems.
When you have done that, start a new topic and post the required logs to Virus, Trojan, Spyware, and Malware Removal Logs forum, NOT Here, for assistance by the Malware Response Team Experts.
Please Use Copy and Paste for your responses, and Do Not Attach them unless your helper requests this.
If HelpBot responds to your topic, please follw its Step #1 so the team will be notified.
After doing this, please reply back in this thread with a link to the new topic so we can close this one.