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Assuming you want Outlook Express:
From
http://www.fjsmjs.com/OE/defaultl.htm
Go to Start | Run and type this command, with the double quotes and spaces:
"C:\Program Files\Outlook Express\msimn.exe" /reg
and then make sure that OE is selected as the default mail program in both
IE and OE.
If that isn't enough, see this article:
"Send To" and E-mail Links Do Not Work Using Outlook Express as Default:
http://support.microsoft.com/?kbid=306098
You might also want to try this:
Restores OE to the E-mail clients list in Internet Options
http://www.dougknox.com/xp/scripts_desc/oe_client.htm
To set Outlook 98, 2000 or 2002(XP) as the default mail client,- Go to
Start, Run - Type in the following with quotation marks and press ok
"C:\program files\microsoft