Save your work to a computer file that is compatible with Win Movie Maker (I don't use WMM so have NO idea what files it will edit)
Read the SHARING links in The Elements Tutorial Links Page http://forums.adobe.com/thread/1275830
The following document will tell you about files supported by Windows Movie Maker
What do you have - Windows Live Movie Maker 2011 or Windows Movie Maker 2012
What computer operating system is your Premiere Elements 7 and Windows Movie Maker running on?
What are the properties of your video that is now in Premiere Elements 7 which you want to export to a file saved to the computer hard drive.
If you will supply me with those details, I can post export settings that you can use for export of the Premiere Elements 7 project.
How do you intend to export your file from Windows Movie Maker?
Looking forward to your follow up.