Dell's apparently shipped a number of Vostro 1310 and 1510 laptops to the U.K. with a screwed-up keyboard layout. The issue was first emerged, at least Internet-wise, on a Flickr page, where a disgruntled Vostro owner showed off the funky layout.
The original patch was (what else) a security update. It was released earlier this week on Patch Tuesday. Unfortunately, that patch causes another issue, where in Excel 2003, calculations will be incorrect when a Real Time Data source is used in a user-defined Visual Basic for Applications function.
