You moved the entire /LaunchDaemons/ folder to the Trash?!? I'd meant for you to check inside each of those folders, looking for a MS Database Daemon to remove. OSX needs the other items in that folder in order to work.
Do you have a Time Machine backup? If so, you can boot from your install DVD, enter Time Machine, and restore that folder.
If you have another Mac handy, you can connect them via FireWire cable. Boot your problem Mac in Target Disc Mode, and use the other Mac to put the LaunchDaemons folder back. (then do a Permissions Repair in Disk Utility before rebooting)
If no other Mac is available, then you'll have to boot from the Install DVD and do an Archive Install, preserving users and groups.