[>BKA< T Wrecks]

I can't confirm that from my own experience. I have Opera and IE on my internet machine, and I even surf the web using both of them at the same time sometimes - IE for secure and trustworthy sites, Opera for others (due to its easily customizable and generally better security features). You can import your IE favourites (which I don't use) into Opera automatically, and the only question you have to decide is which browser to associate HTML files with, if you have some saved on your HD.
To be precise, if it weren't for the insanely high integration of IE and Windows, I wouldn't use IE at all. But some programs -even some which have nothing or hardly anything to do with the web- require IE, and besides there are some crappy sites out there that aren't programmed according to valid and widely agreed programming standards, thus only working with IE. That's the only reason why I kept it. But I have never experienced any problems due to the coexistence of IE and Opera on my machine. Or could you state an example? Maybe I just don't recognize them...?