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Kira20, I see sourcemod.2.l4d2.dll loaded in left4dead2.exe.
Looks like you are hosting the listen server, that is officially unsupported.
- Remove "addons" folder
- Do "Integrity check" via Steam -> your game -> Properties -> Local files -> Check integrity.
- Make a normal local dedicated server: instruction is here:
SourcePawn Scripting - Tips, Basics to Advanced, Section 2. Server Setup. AppId for L4d2 server is 222860. See also remarks
here.
I would also suggest you try to disable BitDefender during the tests.
If crashes still occur, install
Accelerator and give as a report from the main page and call stack (View Raw).