Your best bet at this point might be to try and restore your computer to an earlier time (you do have restore turned on right?). Try and pick a recent restore point date that windows picked at random. Windows will set a restore point before installing or upgrading Hoster but it's been my experience that those won't work.
I try to tell everyone to manually set a restore point before messing with Hoster because the "just-in-cases" happen at the worst times
Sam
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