Click the _correct_ 'cancel' button or your PC may get infected

A trojan site mimicking a YouTube or iPlayer video and a Windows XP warning, as seen in Firefox. This was seen after clicking on an news headline in spam. If you have followed a link in an email accidentally and see something like this, stop, get out of the browser (if necessary with Ctrl+Alt+Delete), check your antivirus and Windows are both as up-to-date as possible, and run a full virus scan. “.exe” means the file is executable and will take over your computer. This example can use JavaScript to install itself under MS Internet Explorer without you clicking anything further. Then it will start sending spam from your computer.