Has anybody who has upgraded Windows 8 through the Microsoft Store figured out a way to capture the Windows 8.1 update and slipstream it into Windows 8 to make a clean install of Windows 8.1? As it is now, the 8.1 update, strips out most registry customizations, leaves un-deleteable $Windows.~BT and Windows.old directories on my C:\ drive and junk throughout the appdata and Temp directories.