No idea what you mean by this...
You can uninstall from the admin.. (Same place you would have run the IH2 install) Would be easier to simply restore your site if you have a back up of the site prior to installing IH2..
However it really looks like an incorrect IH2 install is at play.. What is happening on your site would not be caused by IH2 if installed correctly.. Of course since I can't see your site I have not a clue as to what other modules you might have tried to install along with IH2..
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