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I have done lots and lots of experimenting with this. The best website to do it is keepvid, which converts it to mp4 when you download. If you are using firefox, though, get the add-on greasemonkey and then on youtube videos you will see a "download" button. Keepvid works jsut was well.
yes, i realize thats not what you were asking, but i had this problem before too when i was trying to use movie maker. i then proceeded to download sony vegas 9.0 pro, and it worked perfectly. so, i was simply trying to help you out by giving you advice that worked for me when i was in your situation
Ok thanks i downloaded vegas 9 and i can get the file into the program. It saves as a .veg though, is there any way that I can change that? Also when i try to convert it to an Mp4 it says that there is a missing codec and something about parameters so it can't do it.