You probably reset your email account settings when you uninstalled IE7.
When you open your browser, find the internet options tab. I think it’s in Tools? Somewhere in there is the tab that says “Internet Options”
Open that and you’ll find a window with a tab that says PROGRAMS
Click on that and you’ll see the programs associated with various functions
One should say Internet Mail. That needs to point to your email account: mine says “NETSCAPE MAIL” as I use netscape.
Hopefully that’ll help.