Don't just your uninstaller from the the control panel. Go into your C: Program Files and hunt for it to uninstall. I had the same issue. It appeared that it was uninstalled but I managed to locate remnants in the Program files. Look for G series as well as Unication. Drove me crazy until I found them.
This solved my problem, back up and running thanks to Signal-Zero
I'm hitting this problem today -- my laptop suddenly crashed for no known reason (probably a Microsoft problem). I had the latest PPS up when the system crashed.... Upon reboot, the PPS won't start (same error situation as above).
I've tried uninstalling, reinstalling (default folder "hung" then seem to finally install) - still crashed.
I uninstalled and reinstalled again -- of course nothing different - fail.
Uninstall and reinstall in different location than the default - crash.
Uninstall - run a registry cleaner - reinstall - crash.
I know some places to look for stuff... will go try and clear some stuff out...
We probably need to document here where these locations are to help others in the future - and also maybe get Unication to address this problem.