Manoel Sagaz,
Here are simple instructions for an uninstall of Avast and
CLEAN install to fix your problems:
1. Save a copy of newest version of Avast (5.0.594) for the version you need and save it to your HDD (C:/drive):
Free –
http://files.avast.com/iavs5x/setup_av_free.exe Pro –
http://files.avast.com/iavs5x/setup_av_pro.exe2. Download the Avast Uninstall Utility, aswClear5.exe
http://www.avast.com/uninstall-utility and save it to your HDD (it has uninstall tools for both 4.0 and 5.0).
You will need to the uninstall tool for BOTH 4.0 and 5.0.
3. Disconnect from the Internet at this time; turn off your connection from the Internet.
4. Uninstall Avast through "Add/Remove Programs" through Control Panel.
5. Boot into
Safe Mode (hit F8 repeatedly) and run the Avast Uninstall Tool.
6.
Reboot.
7. Clean your computer up (clean up cache, temporary Internet files, etc.).
8. Install the newest version of Avast and
reboot.
9. Get Internet access and update Avast definitions.
10. Register your copy or add the license key for Free or Pro.
Please let us know how this works for you.
If you do have further problems, please let us know your OS and other information about your machine, in addition to what other security software (both current and past) antivirus, firewall, and other security software you have on your machine. Thank you.