Unable to read burned CDs

I’m having a problem re-installing software on one of my computers. I re-installed 98SE so I know my CDRom works, but when I try to copy back programs from CDs I’ve burned on a different system, they won’t read. When I put a burned disc in the drive, all I get is a rapid flashing light(green). Am I forgetting to install something or could the drive be too old to read a burned CD? The drive predates burners.

Thanks
Tim

ps… machine is a P1 – 233Mhz MMX with 64meg and a 15 gig HD. (Yeah I know.. bump the memory up, that’s the next project)