1. http://www.oehelp.com/oedef.aspx; then...

2. http://www.oehelp.com/oelnk.aspx

If still no joy, see:

SendTo and E-mail Links Do Not Work Using Outlook Express as Default
http://support.microsoft.com/?kbid=306098
--
~Robear Dyer (PA Bear)
MS MVP-Windows (IE/OE, Shell/User, Security), Aumha.org VSOP, DTS-L.org

B.W. wrote:
A friend of mine has Office installed and now its email programme
overrides Outlook Express as being the default programme. How can he
change it back to Outlook Express.
TIA

B.W.