First of all, welcome to Bleeping Computer! I just need to ask a few clarifying questions. Are you logged into an account with administrator privileges? Are you using Add/Remove Programs, an uninstaller for the program, or a third-party uninstaller program? What program are you trying to uninstall, and Can you install and uninstall other programs?
It refuses to run on those IOS's because the earlier versions of cIOScorp scooped out your Wii's innards and turned them into delicious Scrambled IOS Breakfast, which confused the crap out of their installer and gave TT all sorts of bizarre errors to scratch their heads over.
Limits are temporary, the boundaries of which are to be pushed by diligent study and application of oneself to the problem at hand.