I'm still getting the same error. This is what I'm doing:

1: Install MexicoGPSAtlas2011v60.exe
2: Use JetMouse to make unlock code
[Only registered and activated users can see links. ]
3: Open MapSource
4: Click on Utilities > Manage Map Products
5. Click on Unlock Regions
6. Add the unlock code that I got from JetMouse
[Only registered and activated users can see links. ]
7. Open MapSetToolKit
[Only registered and activated users can see links. ]
8. Click on Check Registry.
9. And thats when I get the error.