Garry's Mod closes by itself

I recently updated to Windows 7 (yesterday >_>).

so, everytime I run Garry’s Mod, I see the hl2 logo in the taskbar, then it automatically closes. When I first ran it, it told me to allow access to GMod, so I did. Did this mess it up or something? :\

Try turning UAC off (it sounds like UAC was asking you for permission)

Alright, I’ll go redownload GMod, I’ve been reinstalling it and other methods to see if it would work.

One more thing, does anyone else have trouble running TF2 and Braid on Windows 7?

EDIT:
Nope, still didn’t work with UAC off.