10.10 Would not install. Said my Macintosh HD was used for time machine

I have a 27" iMac that has been running Lion.  I download Yosemite to my computer.  Checked "Agree" to terms.  Next screen showed my Macintosh HD and my desktop external drive.  They were both grayed out.  When I rolled the mouse over them it said each was in use to make backups for Time Machine and could not be used to install Yosemite.  Only my external drive is used for Time Machine.  Does anyone know how to get Yosemite to get past this stopping point?

It was very easy.  Click open your Macintosh HD. This is the root directory of your hard drive.  Change the view if needed, to show the folders icons.  The "Backups.Backupd" folder will be visible.  Drag it to the trash.  Close the Macintosh HD window.  Proceed with your installation of Yosemite.  You should have no problems finishing up.

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