Can we be more specific on what happens when it "crashes?" Error message? Does it go black? Screen goes white? etc?
Double post
I'd almost say it is a bad plugin download if it happens only on wL. Let's try deleting the contents of the folders you have in:
C:\Program Files (x86)\Steam\SteamApps\"name"\Counter-Strike Source\cstrike\download
Be sure NOT to delete your maps folder. That one should be fine.
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