|Wish I could dream up something other than Windows re-install. Unfortunately, despite all the commercial wrangles about MS and browsers, IE is still integrates itself into the system so when thing go badly wrong it is darned near impossible to untangle.|
If it's any consolation many feel Chrome is more secure. On the downside you might need IE for Windows updates (some manual ones at least). Without it the only option is to collect them on another computer then install them via a flash drive.
As this post is getting old I don't think it would raise any eyebrows if you reposted it. It would then attract new helpers and there is always a chance that some bright spark might see a way forward.
Always pop back and let us know the outcome - thanks