According to the leading market research company, ,Windows 7 sales in the USAfor the week of October 18-24 have exceeded those of its predecessor (Window Vista) by 234%. This figureincludes the pre-orders of Windows 7,which had surprisingly -outsoldUK Amazons ownHarry Potter and the Deathly Hallows novelsas Robert B . Stephen Baker, vicepresident ofindustry analysis at NPD, explained: Microsofts