I've had similar problems with Adaptec and it could be a number of things. I would recommend checking the following:
1. DirectCD Software version.
Make sure it is upgraded to version 2.5d. build (296) You can get the upgrades from Adaptec.
2. EasyCD Creator Software version.
Make sure u are running version 3.5c build (263)
If the CD-RW function worked before, chances are that the CD Writer is failing or you may have changed the environment by installing other CD writer software. This is often a problem in that not all cd-writer software packages supports your cd-writer hardware. When installing these packages they install drivers into directory windows\system\iosubsys.
These drivers are loaded at startup even though they may not be used.
These drivers may conflict with each other. I am not sure which of these drivers are used for Direct cd but you can try fixing it by renaming the .vxd files to .savevxd which will prevent it from being loaded. WARNING: Change the .vxd files one by one and not all at the same time. This may cause other devices to fail but it is a trial and error process and can be laborious.
If you want to be sure, surf some of the cd-writer web sites, they usually have a lot of good information. Unfortunately I cannot remember the urls as i had the problem a long time ago.
Maybe someone else on this BBS knows more about the driver issue.
Good luck