Have both 100 and 250 versions. Desk-top has main H/D 4.3G and secondary 20.0G both partitioned to approx 2.0G drives - so drive listing up to 'Q' with the CD-ROM as 'S'. My lap-top has a 10.0G as a single 'C' drive. If I try to install either ZIPs to the desktop, it goes through the motions but does not assign a drive letter so cannot access them. If I install to the lap-top, they both install OK. The Config.Sys has Lastdrive = Z incorporated. Can anyone out there offer suggestions (apart from the gallon of petrol/box of matches routine)?