I think you're barking up the wrong tree. For some reason, CDR's always seem to place themselves earlier in the drive letter food chain. It's easy to fix, though. Just go into My Computer, right click on either of the CD drives, then choose properties. You should see an area where you can set the start and finish drive letters. Set these to the letter you want on one drive and the other should automatically compensate by revising itself. The error you are getting sounds like you used the CD drive (and it's old drive letter) to install them and they are still looking for the CD in the same place (letter). You can sometimes find a config file (*.cfg) in the program folder for the program you are having the problem with. Open this config file (using notepad or similar) and look for a path to the drive; change the letters and you should be OK. Other programs (like Win98) will have this set up in the registry; use a similar method to change it there. Personally, I would change the drive letters using the first method I mentioned -- much easier and more dependable.