Attempting to install Mountain Lion on iMac running OS 10.6.8 produces the message that ML cnnot be installed on the int. HD because it is used by Time Machine. It is the int. startup drive. What now?

Attempting to install Mountain Lion on iMac running OS 10.6.8 produces the message that ML cannot be installed on the int. HD because it is used by Time Machine. Time Machine is off and the only drive is the int. startup drive. What now?

You may have a folder named Backups.backupdb at the root level of your startup disk. You cannot find it with Spotlight. Just navigate to your startup disk (usually named "Macintosh HD") and drag Backups.backupdb to the Trash.
Is your startup disk partitioned? If so this may be applicable:
OS X Lion: Installer reports "This disk cannot be used to start up your computer"

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    https://discussions.apple.com/message/19033168#19033168
    https://discussions.apple.com/message/15699444#15699444

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