firefox doesn't remove IE when it installs and it should still be on your machine and still work unless you purposely deleted it later. you can even run FF and IE at the same time. goto start, programs and see if it's still there.
My IE locks up and closes down and wants to send a report to microsoft. If I open up on FR with IE, when I click on an article to read, it’ll lock up. Now all I can use IE for is for videos.