Hi there,
You could always uninstall avast and perform a clean reinstall:
1.Download the uninstall utility
here. Click Save and save the file to a folder on your computer.
2.Download your avast! product
here. Click Save and save the file to a folder on your computer.
3.Click Start, Control Panel. Double-click Add or Remove Programs. (If you use Vista or Windows 7, this would be called Programs and Features)
4.Select the avast! product.
5.Select Uninstall and click Next. Follow the steps provided. Restart your computer.
6.Start Windows in Safe Mode
7.Navigate to the folder where the uninstall utility was saved and run it.
8.If you installed avast! in a different folder than the default, browse for it. (Note that the content of any folder you choose will be deleted)
9.Click Uninstall and restart your computer
10.Navigate to the folder where the avast! Setup Package was saved and run it. Restart your computer again to complete the process.