Garry's Mod Won't Start

Ok, when I double click on Garry’s Mod, it says “Preparing to start Garry’s Mod…”. Then, it says, “Steam has found a problem with your local game files. They will now be re-acquired to the steam servers.”

http://filesmelt.com/dl/Steam1.bmp

I press okay, and my computer freezes, unfreezes, then continues to tell me, “Steam has found a problem with your local game files. They will now be re-acquired to the steam servers.”

 People tell me that I should go onto the steam browser > games. Then right click on Garry's Mod, and delete local files. I did that, then I went to re install, it prepares, and says "The steam servers are too busy to handle your request.", this has been happening for the past week.

http://filesmelt.com/dl/steam2.bmp

Help, Please!

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