members of my address book are receiving emails not sent by me
You are off topic for the forum you posted to, which is dedicated to Microsoft Security Esentials
Help and support for Windows Live Mail (downloaded from http://download.live.com) can be found here - http://windowslivehelp.com/product.aspx?productid=15
Discussion for Windows Live Mail can also be found here:
http://www.microsoft.com/communities/newsgroups/en-us/default.aspx?dg=microsoft.public.windows.live.mail.desktop&cat=en_US_0405EAE1-3A5E-559F-59E6-B48513D5B57E&lang=en&cr=US
Help and Support for Windows Live Hotmail can be found at http://windowslivehelp.com/product.aspx?productid=1
You may also want to review this post:
https://windowslivehelp.com/solution.aspx?solutionid=6ea0c7b3-1473-4176-b03f-145b951dcb41
And also this blog entry from the Windows Live team:
http://windowslivewire.spaces.live.com/blog/cns!2F7EB29B42641D59!42740.entry
-steve