Windows 7 Gmod crashes on launch

I just did a clean install of windows 7 without any issues, steam is up to date, etc. However, my Gmod will not launch. All that happens is, I click “Garry’s Mod” in the steam library, it launches for a millisecond and then closes without any warnings or information. Help would be much appreciated.

EDIT: Seems to not be working for any source games.

As usual…

Delete everything in garrysmod/garrysmod/addons, Verify Game Cache, update graphics card driver, and if in the end it doesn’t work go to steam/steamapps/common and delete Garry’s Mod. Then on steam delete local content and then redownload gmod.

This happened to me earlier today, however all I needed to do was close steam fully, then re-open it then try playing. Worked for me.