Riv, open up your control panel.
In the control panel folder is an icon marked MAIL.
THis is where all your email settings are. When you removed IE7, it probably cleared this folder. Gates and his trolls are sometimes very single minded and do not automatically equate “Uninstall” with “Restore”.
You’ll probably have to rebuild the mail information that you used in IE6.
If you are lucky, it is still there, and you can just highlight it and select it as DEFAULT.