RE INTERNET EXPLORER AND FIREFOX

I just out of curiosity had a look at what my blog looked like in I.E as I use Firefox, so you can imagine my horror when I find it looking a lot different in I.E than Firefox, so if anyone out there has any idea why I would be grateful for the answer, I also noticed some raw code showing in the I.E browser and I have looked at those settings, it all looks Hunky Dory to me.