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Do you mean play on secure servers? You don't "reinstall" vac, it's... already there. Check your launch parameters and look for -unsecure (or something similar), and remove it.
If your game is crashing... verify the game files, and restart steam.
Please go up to the top of the VAC section here, and read the pinned thread about "could not verify connection". Your system is doing something that is preventing VAC from functioning correctly.
If you see -insecure there, remove it, and the game will launch with VAC enabled.