Την απάντηση στη δίνει το ίδιο το site του Kaspersky:
When uninstalling Kaspersky Anti-Virus 6.0\Kaspersky Internet Security 6.0 by Windows standard means (Control Panel > Add or Remove Programs) a problem may occur and as a result the application is not uninstalled or is partly deinstalled.
To deinstall Kaspersky Anti-Virus 6.0\Kaspersky Internet Security 6.0 completely, do the following:
* Download the archive
KisKav6Remove.zip * Extract all files from the archive into one folder
* Restart your PC in Safe Mode.
* Run the file avp_remove.cmd from the folder, into which you unpacked the archive KisKav6Remove.zip
* Restart your PC