Early Saturday morning, the baner ad service used by The Register became infected with the Bofra/Frame exploit. If you visited The Register Saturday using Internet Explorer, and you’re not using XP SP2, it’s possible that you were infected. More details on the exploit are available here and here.
I’m posting about this since many people read The Register’s feed in FeedDemon. However, please note that this exploit would not affect you if you viewed The Register’s feed in a FeedDemon newspaper, since FeedDemon strips all suspicious code before displaying a newspaper.