had a similar problem - this is what I did.
1, Uninstalled Adaptec and deleted all registry entries (go to Start, Run, regedit) then delete all adaptec entries.
2. Uninstall Nero and delete all entries to it (normally in the Ahead Folder)in the registry.
3. Reinstall Nero, you might want to get the latest download form the NERO website as long as you know your code key you can do this. If you dont know the key you can find it in the registry under HKEY - Local Machine - Software - Ahead
(obviously do this before deleting the Ahead folders in step 2)
4. That fixed the problem for me - hope it helps