Have downloaded Yosemite but can't update ...

I have downloaded Yosemite and am running the installer but it won't let me install onto the hard drive of my iMac, saying that the hard drive is used for Time Machine backups.
The internal hard drive is not connected to Time Machine (I do use time machine but this is backed up to an external hard drive).
Can anybody help?
Nick

Please go into your "Macintosh HD" and see if you have a file named "Backups.backupdb".  If yes > delete it from the location and try to install OS X again.

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