Uploading a video to youtube

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I created a montage video of my son's first year with software called Photo Explosion Deluxe. There is a movie maker feature on it, and I was able to create a file that will run on Windows Media Player. The file is a .dat file, whatever that is. I opened the file in Windows Media player and chose "save as" to attempt to save it in either .wmv or .mpg formats. I think I succeeded, since the file will run in the player. However, I've been attempting for the last 2 hours to upload this video on to youtube.com and it just wont go. I've never uploaded a video there before, so I'm not sure if it's just lagging, or if it's my video. The upload progress bar gets to 100% and just hangs up. I've tried several times, and nothing is working. The video is 81MB and 8 minutes long, so it does meet the requirements. For those that use youtube, is it my video or is it youtube that is lagging? Thanks for helping!