Apparently it's hard to locate a free ISO mapper these days. Like most people I've use Microsoft's Virtual CD ROM to mount ISO images on XP and server 2003 machines. This will not work in Windows 7 and Server 2008 machines. Therefore, I recommend people try out magic ISO instead. It's freeware and can be downloaded from the following URL.
http://www.magiciso.com/tutorials/miso-magicdisc-history.htm