It used to be possible to send multiple photos that would automatically be resized and could be sent using Windows Live Mail on my computer (Win7).  Now when I go into my Photos Folder, select five photos, select Email from the top bar and select Attach, my Windows Live Mail program opens, displaying the photos but a new large window displays in the center of the screen wanting me to "SIGN IN TO WINDOWS LIVE MAIL".  I'm already in my windows live mail program on my computer so why is it asking me to sign in again and what email address am I supposed to sign into?  Am I supposed to sign into my Hotmail email address?

If I ignore that pop up window and X out of it, I can continue to fill in the TO:, SUBJECT:, etc. lines and type my message but when I try to send the email, it will not send.  It stays in my Outbox and an Error message displays Titled:  Windows Live Mail with the message that an Error has occurred and that I should delete the photos and try again.  the Error Code is:  

Windows Live Mail Error ID:  0x8CCC0003

Can someone tell me how to correct this problem and why it is asking me to sign in to another Window Live Mail Account?

Thank you very much 

Mac