Can I revert my phone back to the original operating system??

Recently installed ice cream sandwich, and it came with a lot of unneeded apps. It slowed down my phone quite a bit. It now takes forever just to open up and see my messages, plus my messages has been crashing. Also, the browser is now crap. Anytime I navigate to another tab, when I go back the page has to re-load. Not to mention how slow it is as well. The battery has also taken quite a hit, and seems to be draining faster than it was before.

I am not looking to root my phone, but is it possible to reset it back to what it was?? Get rid of all added applications and go back to how it was before the update??