firefox with noscript and adblock plus or use a mac basically this expliots IE and yea goes to town by auto installing and doing everything djaz posted. I had this happen to me last year going to a game site which had infecected ad servers and auto injected into ie and fucked me sideways till i removed it in safe mode. Be sure to uncheck proxy settings otherwise you will have no internet because 9/10 home users dont use proxies no script stops scripts on every page you visit unless you specifically allow it, scripts are a good way to exploit a vulnerability in a web browser to pick up a "drive by" virus like this adblock plus blocks every ad on any site you visit, thus preventing infected ads on a site you visit infecting you, of course turn it off when on ADJF the reason these are so prevelent on PC's is because even with vista/7 "are you sure you want to install this" notifications, at the very root of the OS you dont need to give permission to install this wheras on a mac, you will notice every single thing you try to install prompts you to put in your password, so if these were to target mac OS as soon as it would try to install your mac would ask you for your password and you would know something suss is up hope this helps