I'll guess one of the dell disc is a utility disc.
Look through that disc for wmm and see if it will install.
Here's another option.
http://downloads.tomsguide.com/Windows-Movie-Maker,0301-23258.html
My desktop was upgraded from windows XP to windows 7, as a result I can no longer access WMM 2.1
I still have the original CDs from Dell with XP as the operating system. Is there any way I can utilize the disks to add WMM 2.1?
Thank you

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic