LoneStar
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I'm not sure this works with Win 7---(It should, I think)---but, it's worth a try anyway, don't ya think?
Click this link, from Yahoo, for detailed instructions on making Yahoo your default mail client on Internet Explorer.
You WILL be required to download their "newest" toolbar----use the "download" link that is on that page, to be sure and get the correct one.
That download adds Yahoo! Mail to your PC's list of email programs to choose from.
Then, after you've chosen Yahoo! Mail as your PC's default email application, Yahoo! Mail will open when you click "ANY" email link in "ANY" browser, at ''ANY'' time.
http://help.yahoo.com/l/us/yahoo/mail/yahoomail/settings/settings-10.html