Windows 7 has BitLocker, an encryption feature, but just like linux it needs an unencrypted /boot.

It was just me thinking out loud, and I don't need an encrypted Win7 (it's just for gaming).

Let me re-formulate the question: As I understand the /boot on a stick trick, the whole point is to avoid unencrypted data on the hdd. If so, would it defeat the purpose to do this on a system that dual boots with Windows (encrypted or not), since there is then bound to be unencrypted data on the disk?