I successfully rolled back to 7.xxx on my old desktop [XP Pro], so I decided to do the same on my newish laptop [Vista Home Prem.].
I downloaded [but didn't run] the 7.1.254 installer, then uninstalled version 8.0.
During the install of version 7.xxx, a dialog box kept popping up, saying "True Vector couldn't install, Windows was searching for a solution..." This happened a dozen times during the install... obviously something was going wrong. I decided to uninstall the new 7.xxx version, and try again. Vista wouldn't let me uninstall the new 7.xxx, claiming "the uninstaller was currently in use", and it told me to try again after the other uninstall was done.
So that brings us to the current stage. Apparently, the first uninstall of 8.0 was incomplete, the True Vector uninstall is locked up. This is keeping the roll-back to 7.xxx from installing True Vector, and is keeping the new 7.xxx from being uninstalled as well. I have no usable version of ZASS on my laptop.
Operating System:Windows Vista Home Premium
Software Version:7.1 (Vista)
Product Name:ZoneAlarm Internet Security Suite