CDRW writing error & hanging

I'm having a problem primarily with my CDRW. It's gradually come on and become worse over the past few months. I can write information to a CD-R disk, however when I try to read the information back off the disk, some of the files are corrupt. This has become worse, until now almost all the files are corrupt on any CD I write. Also I've noticed that the computer will often hang when playing a game/installing software from a CD in my CDRW drive.
I also have a DVD drive, and I very rarely have the same problem with it hanging if I run the same software or install from this.
I have changed my CDRW drive as I initially thought it might be dud, but this hasn't cured the problem.
I've run AVG 6.0 with the latest update and it can't find any viruses.
I've tried various settings for DMA on and off ect none of which seem to make any difference.
I've tried swapping the drives around (ie master/slave and which cable they share) but this hasn't helped either.
I've taken it to three shops but the problem seems to stump them...

My current system is:
Win 98SE
1.2 Athlon
756Mb memory
ABIT KT7/KT7-RAID mother board
primary master IBM HDD
primary slave empty
secondary master LITE-ON CD-RW
secondary slave Compaq DVD-ROM

Anyone got any ideas?

 

Have you tried replacing the ribbon cable? And have you moved the CDRW to primary slave?

MBN