Yes, the Base Framework installation program installs the ISV certificate. You can manually install it by running the following program from a Windows command prompt:
C:\Program Files\eXc Software\WMI Providers\nonWindows\GenerateSelfSignedCertificate.exe
You should really run it from a command prompt instead of double-clicking it so you can see any errors.
The unauthorized access message indicates a permission problem. If you plan to uninstall/reinstall, can you turned off UAC, restart Windows and try again?
John