Down loaded Mavericks, will not install on my computer because it says "this hard drive is used for time machine back up".

Down loaded mavericks, it will not install on my computer because it says" this hard drive is used for time machine back up". So I used my old computer  hard drive for back up and reloaded the program but it still says the first hard drive is being used.

Welcome to Apple Support Communities
Make sure you have selected your MacBook Pro's hard drive as the destination to install Mavericks. If so, you have the "Backups.backupdb" folder in the root level of your hard drive.
That's the folder used by Time Machine to store backups of your files, and the Mavericks installer understands that your internal hard disk is the Time Machine drive.
To fix this, open a Finder window, select the Go menu (on the menu bar) > Go to Folder, and type:
Then, delete "Backups.backupdb", empty the Trash and run the Mavericks installer. Finally, install OS X Mavericks

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