It is not good to install avast in safe mode.
Which was your previous antivirus before avast and how did you uninstall it?
I suggest an installation from scratch:
- Download the latest version of avast! Uninstall Utility and save it.
- Download the latest avast! version and save it.
- (Optional) If you want, save your avast! settings for later restoration (Settings > Maintenance > Back up).
- Uninstall avast from Control Panel (if possible) and reboot.
- Run the avast! Uninstall Utility saved on 1 in and follow the instructions. Reboot in Normal mode after that.
- Install avast! using the setup saved on 2. Boot.
- Register your free copy or add the license key for Pro. Or even upgrade your key from old versions.
- Check and post the results.
Please, be patient, boot when it’s said to boot…