Yes, sure.
Eicar download page. These are harmless, and designed to test the antivirus. If you attempt to download the first one (Eicar.com 68bytes) the Avast webshield should block it. If the webshield is paused, and you download the file to the desktop, any action with that file should produce a standard shield warning.
Did you try all the ideas in my reply #2? More ideas:
1) Try going
here, and downloading tool number 8, and running it.
Did you have any of these problems with your previous installation of Avast?
2) Does your computer have any malware symptoms? Try the free version of
MBAM.(Blue download button.)
Download, install, and update it. Run a quick scan. At completion, select everything found, and then click on "remove selected". If it asks for a restart, do so immediately. Please post the scan report.
3) You may have to do a full reinstall from scratch.
The steps:
-Download the full Avast installer file.
Direct download - Russian 37.02Mb or
Direct download - English 36.99Mb. Save one of these to your desktop.
-Download the Avast uninstall utility from
here.-Disconnect from the internet.
-Right click the tray icon, select "Program settings" then "troubleshooting" then disable the Avast self defense module.
-Go to the control panel>add/remove programs and uninstall Avast. Reboot. If you have trouble uninstalling, reboot into safe mode.
-Run the uninstall utility "aswClear.exe". Reboot.
-Install Avast from the setup file. Follow the setup prompts. If there is any suspicion of malware, let it perform a boot scan. This will take a while. If you are reasonably certain it's clean, you might want to skip that step.
-When it is installed, reconnect to the net and get updates.
-Please let me know how it goes.
Only perform the steps that are required to get things working again. No need for a full reinstall (probably) if, say, the DrWeb remover fixes the problem.