Today one of my colleagues showed me this great site where you can download all the boot disk images from MSDOS 3.3 to Windows XP. Then you can use these images to start up a virtual machine. These ISO CD-ROM images have been created to allow you to boot your computer from a CD for the purpose of repairing various issues. The CD images are an exact copy of the boot diskette images. There is no advantage to using these ISO images over a diskette image. Some newer computers do not have a floppy drive installed, so these images allow for compatibility of newer machines.