Microsoft managed to move more standalone Windows 7 software units in its first week of sales than it did with Vista, but Windows 7-based PC sales were not as high as they were with Vista, according to Thursday data from the NPD Group.Software unit sales of Windows 7 were 234 percent higher than Vista’s in their first few days of sales, resulting in dollar sales that were 82 percent higher than that of Vista, NPD said. PC hardware sales, however, were “more of an uphill battle,”...