system
13
@nuyoknuyok,
I would suggest running the removal utility for Avast, under Windows Safe Mode directly, repeating the procedure for ALL versions / editions you ever had or tried in your system.
Then manually delete any (possibly hidden) folder containing the words “avast” or “alwil”.
Then completely disable your firewall.
If you had previous security tools that you think are already uninstalled, find their respective removal utilities and run them, also from Windows Safe Mode.
After all this is really clean, download the latest stable version of AIS and run the setup.exe with “right click → run as administrator” (for Vista / Seven).
Reboot immediately after the installation finishes (before any configuration or update, just reboot).
You should be able to test all features of AIS, including the firewall, for 30 days. During the 30 days, if all goes as expected, buy your license for AIS.