See our FAQs (Frequently Asked Questions) section of the forum.
It will answer MANY of the questions you will need to ask before actually posting.
Including, trouble with access, and if that doesn't fix your issue, how to reset ULX.
Link =
http://forums.ulyssesmod.net/index.php/board,30.0.htmlIf you have to reset your groups, yes, you'd have to reset the permissions changed.
(Which, it sounds like you broke something/changed something you shouldn't have in the first place)
Never delete any Gmod group named superadmin or admin in any admin mod, whether it's ulx or not. Every addon written for Gmod usually expects superadmin to be the highest group in the game, and admin as second highest, all other from there are custom.