The game won't start

[DutcH233]

hi guys
everytime I try to start the game it shows a blue screen for 2 secs and then it says "hl2.exe won't start"
can anyone help me?

[Scratch]

Have you validated your game cache files?

[predator cz]

Remove/move your entire garrysmod directory and try it again. If your gmod dir is in USERNAME folder the reinstall whole game. You can also send here dump file.