Re-Install Windows 7 with bitlocker on hard-drive

I have laptop with WIN 7 Enterprise and installed bitlocker. Now I want to re-install win 7.

It's possible or disc will not allowed me to install new copy of win7?

If I can't, can I somehow remove bitlocker (I don't have any password or PIN)? Or only way is to plug in new hard drive to my laptop and then install win 7?

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