Need help exporting my Windows Live Movie Maker file! Help?

Hi there, so here's my problem. I saved slideshow that I made on windows live movie maker. I put it as an attachment on my email and sent it to my teacher. H e said he did not recieve any file. He mentioned that the problem was that it will only work on my computer as it links to the files on my machine. Just to note he use a different version of windows movie maker. He told me i sent a blank file and that i need to save it as a wmv file. help!!! how to I do this?!?!?1 best answers gets 10 points