It simply doesn't work on Windows 8
There is a small proportion of windows users that still cling on to legacy hardware that won't run on Win 8 (ok probably just me), but I cannot afford to replace, things like music interfaces, graphics tablets etc until I absolutely have to.
Also Metro screen? What were you thinking Microsoft? (yes I know it is slightly improved in 8.1, but as this comment thread proves, techies never forget!)