Help! Automatic open after downloading?!

Ok, this is driving me crazy!

When i click on a video link in an email (like a WMV, AVI, MPG file) it will download to my desktop instead of opening automatically. This is now causing me to have to minimize my browser, watch the video file from my desktop, delete it, then go back to my emails. Instead, i used to be able to just watch the file in my hotmail, then simply delete it. I know how to change where i want to save files to, but cant for the life of me figure out how to have them automatically open after the download, and not have to deal with deleting the file when the video clip is over, as i would just delete the email itself that the video was attached to.

Any info or advise would be a great help!