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Anyway, right mouse click on Garry's Mod in your steam library and click Properties, then click on 'Set Launch Options...' and type: -dxlevel 90
Click Ok and you should be good. If that didn't work, try changing the 90 to 85.
Tell me if it worked.
Also, make sure to test this with all addons disabled so that you are a 100% sure that it is not one of them that is causing the problem.