What Operating System?
Just uninstall Incredimail ... please ... for God's sake. It is like a virus .. and some damage to registry has already been done .. as once all their stuff has been placed there .. it stays there without manual intervention.
Once un-installed ..
Run Outlook Express (if on XP) or Download latest Windows Live Mail.
If you are on W7 ... and want to keep email simple .. download Thunderbird and use that.
You will need the email ISP settings (from your ISP, or out of Incredimail .. or whatever you used when you installed the horrible thing) to put into the program.
Use Thunderbird if I were you.
http://www.mozilla.or.../thunderbird/download