Asyn
3
First, be sure to get rid of all remnants of your prior installed AVs.
→ http://www.avast.com/faq.php?article=AVKB11
Then:
- Download avast! Free Antivirus: http://files.avast.com/iavs9x/avast_free_antivirus_setup.exe
- Follow instructions: http://www.avast.com/uninstall-utility (Run this tool for all prior installed avast! versions…!!)
- Reinstall avast! with the downloaded installer from point 1.
- Reboot.