Lion Installer thinks that my internal boot hard drive "is used for time machine backups"

I recently installed a new hard drive on my MBP. It's been running fine, but now I'm running into trouble when I tried to install Lion!
The download worked just fine. But when I try to choose a disk to install Lion onto, my one and only hard drive (internal, boot disk) "is used for Time Machine backups" and is grayed out! I can't click it, I can't customize the installation or do anything except go backwards through the license agreement and such.
No, I do not use my internal drive as a Time Machine. But somehow, even after I've disabled Time Machine, it keeps thinking I do! Time Machine is my menu bar is grayed out, but I can click "Browse other Time Machine disks" and for some reason my boot disk comes up! ("(My name)'s MacBook Pro on 'Untitled 1') I've never used this disk as a Time Machine!
I have a feeling that this is somehow related to my using Super Duper to clone my old hard drive during the upgrade process.
Is there a way to remove the Time Machine files from my boot disk or otherwise convince Lion to install? I've already repaired my disk permissions in Disk Utility. What else can I do?
Thank you in advance. This is very frustrating!

Alexander Chan1 wrote:
No, I do not use my internal drive as a Time Machine. But somehow, even after I've disabled Time Machine, it keeps thinking I do!
At some point, probably accidentally, your internal HD was selected as a destination for Time Machine.   Even if that was immediately changed, it had already created a Backups.backupdb folder at the top level of the drive.
As long as that's there, OSX thinks you're trying to install OSX on your backup drive.  Just delete that folder.

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