Can not installed mountain lion msg" macintosh hd is using for time machine back up" please help

I downloaded mountain lion but can not install, msg" macintosh HD is using for time machine back up , how can I change that...thanks

Somehow, a Backups.backupdb folder got created on your startup drive.
You won't find it via a Spotlight or Finder search, so open your internal HD via the Finder.
That folder is at the top level.  Just delete it.

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