Thanks. It's like I've thought.
They released the BitDefender 2008 Suite and the version 10 became free 
I'll test it.
Great! The problem I've encountered is two BD services (BDRsDrv and BDFsDrv) are not starting because the files are missing. I think this is just a clean-up problem from when they changed the program from paid to free. It appears there are still registry entries calling for these services (probably some real-time protection) but the files themselves were deleted from the free version. This hasn't seemed to compromise the program, though, and you won't get any pop-up messages. I first found out about it when I noticed two error messages in Event Viewer, always corresponding to a boot/ reboot. Others have noticed this, too, and I added to their thread on the BD Forum. No definitive answer yet.
Let me know how you make out, Tech.