I uninstalled 3.6.2 (current version is 3.6.5).
Machine would not reboot (went to black screen with cursor).
So I did a system restore via the recovery disk. Now it's installed 'again'.
I'll probably go to their forum when I have the time and ask for a recommendation.
It's obviously to do with Classic Shell, but I do have other tweaks made, so I cant blame it solely.
The dangers of tweaking