It's entirely possible that there's no real problem right now. I can easily see Sigil freaking out if the folder specified as the Temp directory (in preferences/ini) no longer existed when Sigil is opening.
I still don't know that I'd completely reinstall yet. Make sure the Temp folder Sigil is looking for exists, and then after Sigil launches, use the "Auto" button to set the Temp folder back to Qt/Sigil's default. Then restart Sigil.
Reinstall if you like (though your preferences/plugins will persist if you don't delete Sigil's AppData/Local/sigil-ebook folder). It could be easier.
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