Yeh, that crosssed my mind too. I was using a HS disc at first and then switched to a 4x CD-RW but no change. The guy had Roxio EZCD Creator and DirectCD installed on the machine before so I figured there was a conflict going on. I tried using the Add or Remove Programs to uninstall DirectCD but it failed because it said it couldn't access an external file, etc. Those two programs had evidently had some of their files removed manually and he doesn't have the original CD's to re-install it. So, I found the "Roxiozap" utility, ran that and then went through the system and Registry to remove all instances that I could find for both Roxio and DirectCD. But that didn't resolve it.
So, what now? Again, I can read both CD-R and CD-RW media. And I can write to CD-R using Nero. But I cannot do anything else with CD-RW media, e.g., write, change, move, copy to files or format discs.