system
15
Welcome to the forums, kassisto! 
It is good to know that you have solved your problem. If something similar should happen again, you might try doing a repair of avast program.
If you are using XP as the OS:
Start > Settings > Control Panel > Add/Remove programs > select Avast anti-virus > Change/Remove > scroll down & select Repair > Ok & follow the directions. You need to be on-line to do this.
Be sure to come back often, learn more, and maybe help others. 