If you want to use the hidden WildTangent uninstaller, it can be found here:
C:\Program Files (x86)\HP Games\uninstall.exe
That is, if you're running an HP machine (they buddied up with WildTangent for some reason and these things come standard on all HP Windows 7 installs.)
If not, you may have to dig for it, but I'm willing to bet it's buried in the "Program Files (x86)" folder.
I ran a search via Windows Explorer (not to be confused with Internet Explorer) and found 3 locations for WildTangent related files, this being one of them. The others are benign or can be removed using the Program Uninstall feature found in the Control Panel.
It's a little easier/safer than digging around in your registry and it definitely did the job in getting rid of the game providers.
Brink's tutorial is the way to go if you're looking to remove the other Windows 7 games, though.
Good luck with your removal!