GMOD Graphics GLITCH - HELP!

Hello there.
Well, lemme describe my problem.
Before i reformated my PC, GMOD worked fine before. No glitches, no bugs, perfectly smooth and i could play with it. I had problems with my PC because of some reason my PC wouldnt run correctly and safe mode would freeze. I had to reformat it and reinstall windows. Anways, when i tried GMOD after, the menu was sightly laggy and the models/map were glitched in game (There was grey lines throught the map or something like that) but suprisingly, the game itself didnt lag.
**
*Gosh, what? I can run TF2 in Medium/HIGH Quality Fullscreen and NO PROBLEMS. ***

I tried to fix by changing the settings to low to high. Still nothing changed.

Wow, GMOD used to work… now it’s glitched up. How the heck i am going to make GMOD movies if i cant even use GMOD?

What happened?.

Here’s my specs:
AMD PHENOM X4
9550 QUAD-CORE.
2,21 GHZ
201 GO of free space.
6GB of system memory
Nivida Geforce FX 5200 (YES, ITS A OLD CARD, I UNDERSTAND BUT I CANT REALLY REPLACE WITH A NEW ONE SINCE MY PC DOSENT HAVE A SLOT FOR NEWER GRAPHICS CARD)
Windows 7 32-Bit.

Believe it or not, I’ve had a similar problem that was caused by glitchy graphics driver updates. Maybe try reverting to an older install if possible? The menu being laggy wouldn’t be a side effect of this problem however, have you tried verifying gmod cache and disabling all your workshop addons?