For those who have problems downloding the file:
Just create a .txt file somewhere on the desktop and copy this code:
Windows Registry Editor Version 5.00
"installdir"="G:\\KONAMI\\Pro Evolution Soccer 2013\\"
- then rename the .txt file to "pes13.reg", and open the file. It will appears a message that will ask for your request on adding a registry to your machine, just give the permission and the game will be fixed.