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If i want to launch tf2 my computer says steam has found a problem with your local game file game and that local game files will be re acquired from the steam servers what am i supposed to do

If i want to launch tf2 my computer says steam has found a problem with your local game file game and that local game files will be re acquired from the steam servers what am i supposed to do
The easiest would be to re-download Team Fortress 2. Right click on Team Fortress 2 in your games-list, delete local files, and download it again.