Problem with launching the game.

What should I do?! The demo used to run fine. The intro videos and menus – everything ran smoothly without any lag. I set everything to the minimum, installed the latest drivers... :( It crashes, no matter what I do. Loading a map (any map) reaches the end, and then either the sound suddenly freezes for no reason, or a blurry image of the map appears, or it just crashes without any explanation!!!

Added 8 minutes later
I just launched it through the command line, and Windows gave me an error. Are there any knowledgeable people on the forum who can help with this? I can send a screenshot.