If you still want to use Gamespy, you have to uninstall it much like MOH:
Uninstall/Attempt to uninstall it
Reboot
Get a registry Cleaner (
http://www.jv16.org)
Clean your registry automatically (Tools, Registry Clean, Do Them All)
Reboot
Reinstall Gamespy.
If you have a high-speed connection, I suggest you download it from gamespy.com