Dvdrgctl.dll Was Not Found

I tried to play a DVD and got the message "a required .DLL file, DVDRGCTL.DLL was not found". I have spent many hours searching for answers. My system:
Compaq Presario 1800/ 98SE/ Pentium III - 650 MHz/
Toshiba DVD-ROM/ SD-C2302 DVDROM/ Firmware Revision 1W13

I don't know if I accidently cleaned something when I was doing Spybot/adaware cleanup some time ago. Haven't used the DVD player for a while. I also ran something that was supposed to clean the register. It may have been EasyCleaner. I remember it was something that was supposed to find all the extraneous stuff that no longer was pointing to anything. I may have a file somewhere with a list of this stuff. Don't know where it would be or if I deleted it. OK-I need to keep a better track of what I did.
Any help out there?

 

have you tried reinstalling your dvd player software?

 

I fixed it! Got a post back on duxcw.com forum. I looked for the file name using find and ended up using Internet Explorer to track it back to a WINZIP utility of CleanSystem. I got back into the backup file of all my "cleaned not used DLL's" and restored them all.
Thank you.
(I don't know how to selectively reinstall the DVD software from my Quick Restore CD or Emergency Recovery CD.)