You can try the latest NEC 2500 firmware 1.09 (German site isn't too well organized, but it's on the bottom of the page) http://www.de.nec.de./softwareoverview2.php/id/557
1. What are you computer hardware specs?
2. Are you running any packet writing software like InCD or DirectCD? If so, which version?
3. Do you have an ASPI layer driver installed?
4. What do you mean by OEM cd's?...the ones that get included with by manufacturers that have drivers and stuff? Also for CD-R(W)'s which brands are you trying to use?