Quick word to the wise... It's not enough to just use AdAware and Spybot, you have to make sure to update them regularly, just like your AV program.
But my guess would be that you've got a problem with Flash/Java craplets. The ESPN website is almost entirely Flash based from what little I've seen. As I'm sure you can tell, I've got unfond opinions of Flash, so that's all the more I'm going to help. I don't want to do anything that might directly, or indirectly, encourage people to create more useless, bandwidth wasting, annoying animations. It's too bad the one or two good uses of that technology get drowned in a sea of crap.
bought my laptop a few months back, and a TON of 'sites say "Not Responding" and freeze up; happens most on ESPN.com.
Any tips? Yes, I use Norton's, Spybot, and AdWare, and they never find anything.