Ever since upgrading to 6 I can't turn the Kasperski virus ad off. I paid for Parallels and shouldn't have to put up with advertisements. I click on the "don't show this" button, but every couple launches the ad comes up again.
The Kasperski virus software is only a 90 day trial so you have to remove it or pay for it eventually. Read the "Setting Up Virus Protection" section in the Parallels Desktop help menu.