Uninstall ESET, then uninstall Antivir, then reinstall ESET.
Yip I tried all those suggestions, including changing the registry and reinstalling Windows Installer. Hrmm, what's another program that has a...
Have you uninstalled all previous Antivirus?
I kept getting the error when trying to install the trial of NOD32 "This installation package could not be opened. Contact the application vendor...
Separate names with a comma.