Virtual DVD

http://www.slysoft.com/en/download.html
This is now the best one. It give a context menu to mount the drive

Need to remember

That a bad video driver will cause the hibernation function of XP to not work.

Magic Disk

http://www.magiciso.com/tutorials/miso-magicdisc-overview.htm is a Virtual CD program. It seems to be the best. I found DTLite which really sucks. I would cause my computer to lock up when I was Ripping a DVD from Xilisoft or Handbrake. Got rid of it and installed Magic Disk.