Microsoft has been promising a cheap-and-cheerful upgrade path to Windows 8 for those who buy new PCs. But what about that five-year-old PC in the basement? If the historically well-connected Mary Jo Foley of ZDNet is right, the upgrade path will go further back -- much further. Although upgraders will still want Windows 7 if they need to carry over absolutely everything, tipsters claim that settings can transfer from releases as old as Windows Vista SP1. Those with truly an