>>123103383
How'bout reformatting/reinstalling Windows (or whatever OS you're on) and trying a fresh TF2 install on a fresh OS install.

Update video card drivers, if that doesn't work, back up your files and do a full reformat of your rig. It's probably due for one anyway.

>>123103509
It's not worth that, even if that definitely fixes the problem.

>>123103613
Formatting periodically is a good idea anyway. Get yourself an external hard drive and back up your important shit, then get to setting everything back up. It's a pain in the ass and a good few hours of work, but it is worth it to see your performance go back to what it was when your rig was brand new, and you'll be able to play that game you love so much.

>>123103905
I reformated my computer about 3 months ago. I hated it and I'm going to wait the maximum acceptable time before I do it again.

>>123104092
Well then I don't know what to tell you. Enjoy your no hats

>>123103383

The only thing I can think of is have you tried playing offline? (I know this isn't the point, but if you at least try it it will give me a better idea of what might be wrong) I don't think it's a video-card driver necessarily, trying cutting the actual folder out and re-downloading starting the game like that. (I had a similar issue when experimenting with custom models) There's got to be a way to fix this, because it seems like you were able to play it before. Does your computer completely black screen, or is there a message you can at least right down before it crashes? My guess is it has to do with your steam rather than the game, but I'm not sure.