Having a problem with our second desktop computer. The CD-RW drive reads files/folders, but it no longer writes to disk. Says disk is full, but it isn't. We've tried different types of blank disks. No luck. It does copy burned music files to disk most of the time, but sometimes it doesn't, but the biggest problem is it won't copy files/folders of pictures or documents any longer. It seems to get confused when we switch from CD-RW disks to CD-R disks. It thinks it's still reading a CD-RW when it's not. Does it need drivers or need replacing? I do have a spare drive and have tried installing it, but was unable to get it to work. Where I bought it, they just said, hook it up and it should work. It's not that easy. What needs to be done to get a new optical drive to work? I believe it came with an installation CD, but if the new drive won't work, how can I run the disk? What can I do?