Unable to use any user maps

When ever I try to load up a user map, Evo City v17 or v33, the meet the medic map, mobeniex, or even GM apartment it alwaysw freezes on “Loading world”

If it matters at all, I’m running the game on windows XP SP2.

If any other information is needed, Let me know and I’ll get it.

Ok, I’ve now made a video of the problem

Have you tried with a fresh game copy?
Try re-installing your Garry’s Mod.

Yes, I have. the gmod in the video is fresh.