Garrys Mod Keeps on crashing on startup.. - Please help

[xCron]

About 2 - 3 weeks ago, i was happily playing trouble in terrorist town on GMod. After stopping for a while and coming back to garrys mod it seems to have been updated. When i load the game up i see a little bit of the loading screen and then it just transforms into a dark blue screen. I tabbed out and went back in and it crashed and said engine error failed to lock vertex buffer in CMeshDX8::LockVertexBuffer
I have this in my launch options for steam because if i don't it gives me a blue screen, i put this in before update: +mat_bumpmap 0 +mat_picmip 2 -dxlevel 80
My problem is the crash
Anyone know what to do?
:(

[allon]

Don't want to sound like a moderator but there's a special section for questions like these. You'll have more luck getting the answer you need there.

[url]http://facepunch.com/forumdisplay.php?f=16[/url]

[xCron]

Thanks :)