Looks like Windows 7 is off to a much stronger start than Windows Vista, with the NPD Group claiming the first few days of sales saw a 234% increase over Vista's start. Part of that can be attributed to special deals and low-cost pre-sales -- total revenue was only 82% higher -- but it's hard to deny people are stoked for Windows 7. Interestingly, the PC hardware growth was actually stronger for Vista than 7 (48% year over year compared to 68% year over year), but there are enough variables at play there to make sure Microsoft won't lose sleep over it. In fact, 7's biggest threat seems to be Microsoft's other products, since Windows 7 PC sales were up against 20% of PC sales being compri
