can't disable program compatability assisant

I have them disabled in both services.msc and gpedit.msc, but when I try to run certain programs it still comes up with this:



How do I fix this? This is just wrong and restrictive.

It's Windows 7 using XP Royale skin, Windows 7 x64 Ultimate. I am getting WMP10 (because I prefer it) to install, I've followed through the steps on this post but they haven't worked for me.

I disable Program Compatibility Assistant in Local Group Policy Editor and Services:







But it still shows this:



One notable thing is that in the Registry Editor I didn't find "Installed Versions", I simply figured it wasn't there:

Hello?

I found out why PCA was still on, I got it now but now I have a new error:



Can somebody PLEASE help me?