We’ve already heard about Windows RT’s “modest” beginning, and now there’s talk full-blown Windows 8 ain’t flying off the shelves either. According to MS aficionado Paul Thurrott and his insider sources, uptake of the new OS isn’t hitting Redmond’s targets, with the blame being put on OEMs and their “inability to deliver” more inspiring hardware with better availability. Some corroboration of Windows 8’s tricky birth comes from Merle McIntosh, se…