You probably got IE( for Vista OS, it doesn't work properly as the primary browser. Download Firefox for Vista.
I used IE for more than 20 years and it has never worked properly. I"ve avoided other browsers in favour of Microsoft but now I see ther error of my ways and realise that other browsers are actually better. You can still have IE installed but just not as your primary browser.
I just initiated IE 9 as I write this and it is still trying to load my Yahoo home page.