Your issue has been covered here many times. For a resolution,
see
http://windowsxp.mvps.org/MailtoProtocol.htm
Gary VanderMolen
"lowboydrv" <lowboydrv@discussions.microsoft.com> wrote in message news:9DF3F04A-342D-4196-88BF-6B353B337ACD@microsoft.com...
> My issue is similiar. I have also made Windows Mail my default mail program.
> I get the same error message when clicking on an email link (even one within
> an email!). On top of the error message, I suddenly have 40 some odd explorer
> windows opening up stating that navigation was cancelled to retype the
> address. Talk about a pain...try having to close 40 some odd windows several
> times!!!! I hope someone can resolve this issue. Windows Mail is the only
> email client I have installed in Vista Ultimate.