Just go into control panel (large thumbs) -> programs and features -> add or remove features then uncheck internet explorer 8 and click ok.
I disabled it through "remove win features", and allthough it isn't completely uninstalled, it doesn't bother me at all. I don't see it, I don't notice it's presence. Good enough for me. I don't want a browser that I do not use staring me in the face all the time, and the "remove features" fullfills that desire.