Bundling software like this is a malware move. I don't care if they give you the option to not install it, it's no better than the installers that add malware toolbars to your browser if you don't catch the 8th level of dropdowns you need to navigate to not install it.

When I install a pdf reader, I expect a pdf reader and nothing else. When I install anti virus software, that's the only thing I want.