Ever since installing and removing the Vista transformation pack some regular Windows icons were changed to the Vista look there. IE 7, OE has the WM look now, and a few other changes like drive icons in explorer. That requires a registry edit and a text file named "autorun.inf" at the root of the drive pointing to where the icon is located and it's name with the ico extension on it. One article outlining XP for this is seen at
http://www.virtualplastic.net/html/icn_drv.html