If your pc pops up a box saying
"Could not perform this operation because the default mail client is not properly installed"
this means that your pc e-mail program that you are sending receiving e-mail with right now,
is NOT the default one in the Default Programs in your pc.
To fix:
In Start, lower left corner, write in the Search: default,
chose the "Default Programs" in the list.
At page on right side list click: Set Default Programs.
In the list see the E-mail program you have been using all along, click on it and then click OK.
Close everything.
Come back and click on the link above, you will be able to send me and e-mail.