Error Code 53

The Steam servers are too busy to handle your request. Error Code (53).
Cause : Server busy errors, Steam connection errors, and error 53 can often times be caused by anti-virus or other background programs that are preventing Steam from launching your game.
To Solve : Try to close the programs in the backround like:McCaffe : Disable real-time scanning
Steam client problems : Steam Client:

If you are still having trouble, please exit Steam and delete your ClientRegistry.blob file and restart Steam.

If still doesn't work,contact Steam HERE