VirtualDrive, this usefull little app helps me to burn DivX Movies that AutoPlay upon Insertion, with ease! :) It is simply a front end for the app that comes with MS windows called "subst"

you may download it Here
please do not send me bug reports for this app
to use it you select a drive letter that is not currently used then you select a directory and it assigns a drive letter to the specified directory.
Here is a Bonus!
If you want your movies to autoplay when you put them in your drive Follow these simple steps.

1. create a new txt document in notepad
2. open it and Paste the following lines in
----------------Begin Paste----------------
[AutoRun]
OPEN="mplayer2.exe /fullscreen movie.avi"
ICON=autorun.ico
-----------------End Paste-----------------
3. Now Edit the movie title and icon filename
4. Save the text file as "autorun.inf"
5. Burn your movie,your icon,mplayer2.exe,and autorun.inf to a CD in the root directory

your movie will start up and play in fullscreen mode in WMP 6.4!

your done