I have a Dell Dimension 4550 that came with a Toshiba (?) 60 gig hard drive. I want to install a US Logic 160 gig hard drive as a slave (secondary) hard drive. Both are showing in BIOS, but Windows XP does not recognize the US Logic drive. One Dell rep had me disconnect the original hard drive and use the original Windows XP Professional CD to format the new hard drive. Now I get a dual start up screen, but opening Windows XP Professional on the original hard drive still does not recognize the new hard drive. Dell has been useless in resolving this problem despite many hours on the phone with them. Anyone have any suggestions?