===========================
If by download you mean acquire the file from
the web...installing SP2 is your answer.
If you are looking for a way to reinstall the file...
read the following...
===
The following steps previously offered by
Carlos, MCSE are supposed to reinstall
MM2.1.
(you'll need your Windows XP Disk)
1. Go to C:\Windows\inf
2. Right click on Moviemk.inf and click on Install
3. When it asks for your Windows XP cd put
it in and browse to the I386 folder. Click OK
===
What can I do if I upgrade to Windows
XP SP2 and Windows Movie Maker 2.1
is not installed successfully?
http://tinyurl.com/65pfo
or...
http://blogs.msdn.com/deanro/archive/2005/01/18/355050.aspx
Movie Maker 2 - Lost Effects
and Transitions Discussion
http://tinyurl.com/y2wsds
or...
http://www.windowsmoviemakers.net/Forums/ShowPost.aspx?PostID=25682
Bad Installation Of Movie Maker 2.1
http://tinyurl.com/haq54
or...
http://www.remember-christopher.dostweb.com/Wojos_Web/WMM/TroubleShooting/Install.htm