I'm running Vista Ultimate on a Gigabyte GA-P35-DS3R mobo, which apparently doesn't have a TPM on it. According to Microsoft I can use bitlocker by substituting a usb key for a TPM , but I figured I ...

To fix the “Cannot install Windows, BitLocker Drive Encryption is enabled on selected partition” error, suspend BitLocker via Settings or Control Panel, or use your recovery key to unlock the drive.