my experiment failed

I've got a video that I made for my technology class, and I really wanted to post it here for you all to see. If there are experts out there, I'd be glad for you to leave help in the comments.

I made the video in PhotoStory 3 and created a Windows Media file as the final product. It's about 5 minutes long, and the file size is about 20 MB. Blogspot says it will take videos as large as 100MB. When I click the "Add video" button at the top of my text editor, the window opens and says "service unavailable" where it wants me to choose the file. Ideas?