I think you might have your facts confused.
Win7 runs fine without a TPM. It’s not a requirement.
Win8 requires UEFI AND a TPM to function properly. If you have a copy that functions without either, let me know, because they’re as rare as hen’s teeth.
Unless you’re talking about RC. That doesn’t count.
http://rics.partners.org/show_article.php?id=274
I used this method on Win8. “Select Enabled radio button and check the box for “Allow BitLocker without a compatible TPM...”. Click OK and close the policy editor.”