The first rule of Sidewinder Mouse? Download software from the Web. With no disc included in the otherwise comprehensive packaging, the bright startup guide is insistent that that's where you start. It's a 14MB download you need, and cleverly it's grouped with standard mice rather than the gaming menu under Microsoft's tree structure.This, then, is Microsoft's long-promised re-entry into the PC gaming hardware sector, to which it made a token gesture with the release of an Xbox 360 gamepad for PC, but otherwise left alone since abandoning the original Sidewinder gaming line many years ago. The new Sidewinder Mouse is promised to be the first in a line-up of accessories aimed very much at the serious gamer