Take the pes2013.exe file from that folder and paste it into your main installation directory (usually C:\Program Files (x86)\KONAMI\Pro Evolution Soccer 2013 ).
If you are using popular patches (like PESEdit), the error might be caused by the plugin trying to hook into the wrong executable. Navigate to the kitserver13 folder in your game directory. Run manager.exe . pes+2013+no+disc+inserted+fix+repack
By following these steps, you should bypass the disc check and enjoy one of the most beloved entries in the PES franchise. Take the pes2013