There is a known issue between AVG 8 and Anniversary Edition of
Ad-Aware which gives exactly this error, so if you perhaps just got that ad-aware, uninstall it too
before trying to reinstall AVG.
Then run the uninstall/cleanup util for Avast because the Windows
Add/Remove isn't good for uninstalling antivirus programs. Then try reinstalling it again. If you downloaded the installation package, then it provides the uninstall option. Disable Ad-Aware's Adwatch first! Run the AVG installer. Choose the uninstall option and follow the wizard. When you get to the part to remove user settings, select it. Restart your computer then... Now reinstall AVG using the setup file you got and update it.
Restart Windows twice before you re-enable anything disabled earlier.
Should this not work and you get the same error, that means the original errornous installation is still not out of your system. Download the AVG remover from here:
http://www.avg.com/download-toolsRemove your AVG and reboot to make sure it is not there any more, and try installing again.
Let me know if the solution worked and if yes please rate me:)
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