My Dell 4600 is 5 years old. The first problems were with the CD drives were not working properly and it was recognizing a CD drive that does not exist. It began saying that the PC was unstable with Roxio present. I deleted Roxio and that did not help. Then I tried removing the extra drive from device manager. It just reappeared. I tried several other things and now the device manager shows the 2 CD drives and the VOBID SCSI drive with exclamation points but they do not show up as drives in Explorer anymore and don't work at all. In addition, now it does not recognize my USB backup drive. Any suggestions? Any help would be greatly appreciated.