Will,
One last thought (just in case you have not already set this)...
To give the "Save As" option that many have mentioned above the best opportunity to work, make sure that you are running BIAB in "Run as administrator" mode. This is different from logging in to Windows as Administrator.
To set "Run as admin" permanently...
1. right-click on the startup shortcut
2. select properties
3. under the "Compatibility" tab, activate "Run as administrator
Regards,
Noel