Have you tried running a full system cleaner? Problems like this can usually be caused by residual files in Windows.
Also, fully uninstall, reboot, then run the starforce removal tool, then reboot & try again.
Also, Google will throw up some answers but don't limit your search to SH3 related issues. There should be an error code, put that into google to see what's returned.
My money's on starforce.
