Hi all, I have unopened retail boxes of MS-DOS 5.0 and 6.22(upgrade) and Windows For Workgroups 3.11. I've read that that version of Windows may only install once or twice. I don't know about those versions of DOS. I want to make a backup copy of each disk (to other floppies) anyway and will be doing so with a USB floppy on a Windows 7 computer. Are there any special commands/software I should use so that the originals remain in a usuable state?