Thunderbird default client

[johnnydguest]

Hi,

I have install Thunderbird e-mail client at my Windows XP Home edition.
I used Mozilla mail before and I have moved my accounts to Thunderbird.
I've also made Thunderbird as default client in XP. I have the latest version of Mozilla browser which I like very much. Now, when I click on the mailto-link at my home webpage viewing in Mozilla I get a window from Mozilla mail that wants me to register an account. I have tested the mailto-link on several pages in Mozilla and it's the same.
When I click on the mailto-link in IE there's no problem. I get the Thunderbird client. I have install Thunderbird as an stand alone client outside Mozilla directory. Is that a problem? I wonder if someone could help me with this?
Thanks
Johnnyd