Registry or Windows Services Recovery?

I need to do a rather selective restore from a backup on Server 2003 with Exec 11d (space issue). I need to temporarily active a propriety database that needs to be running as a Windows service before I can access the database. I've managed to restore the program files, but I assume issues with Windows services would require reinstalling registry files? Is there anything else I'd have to target to get Window services to run correctly? Are these burried in the Windows folders too?

I know this seems to be a clunky way to go about data recovery.

I tried a complete system state recovery, but that only produced signifcant amount of DLL errors and caused me to have to reinstall the OS and start over.