I ran into this bug yesterday myself, & I've gotta tell ya that I don't much like having to remotely regedit user's machines to fix an introduced bug. Thank gawd that the Google groups are active, because I was able to find a solution fairly quickly in there.

"Microsoft acknowledged the glitches in an official TechNet posting that describes a conflict between the patch and HP's Share-to-Web software, which ships with HP PhotoSmart software, DeskJet printers that have card readers, cameras, scanners, and some CD burners."