If you installed the PESEdit 2013 latest 1.0 patch, some will have this problem "PES 13 WAS NOT INSTALLED?". Annoying right? So, this is how to solve it.
1. Go to Start Menu type Regedit and Enter
2. Now, go to HKEY_LOCAL_MACHINE -> SOFTWARE -> Wow 6432Node -> KONAMI -> PES2013
3. Then double click on code and enter
4. DONE! Make sure Run PESEdit.com 2013 Patch as Administrator.
Now, you should able to play it. Enjoy! Share it!