Easy Fix... Do the following:
1. Click the start (orb) bottom left of your computer screen
2. Click "Default Programs"
3. Click "Associate a file type or protocol with a program"
4. Scroll down until you see "MAILTO" on the left side of your screen
5. Highlight or click "MAIL TO" (near the bottom of the list in all caps)
6. Click "Change Program" (upper right of same box)
7. Now you will see your choices of email programs, select the one you want to use and you are now all set.