Unable to install Lion. Installer says disk is used for Time Machine backups. But it's my Mac's HD.

On attempt to install Lion from CD, the installer says: "Mac OSX cannot be installed on "Macintosh HD". This disk is used for Time Machine backups."
I have an external drive that I've been using for Time Machine backups, but it stopped functioning recently and I have not replaced it.
Is there a workaround?
Thx in advance. Bryant

Maybe this http://support.apple.com/kb/TS2986 can help you.
Stefan

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