Yours is an odd problem. v9 is generally very stable and solid. You could just uninstall and reinstall. For reasons I've already mentioned, you should find your custom settings (property bars etc) remain after this procedure. You could then try installing the SP's as I've described, and see what happens then.
Unfortunately, it is not possible to save a custom workspace for installing after reformatting, so whilst reformatting would probably cure your problem, you would have to reset all your property bars etc. It's worth an uninstall, reinstall though.
Sark
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