I am no pro at Windows OS's but I have heard horror stories of running WIN8 and Flash games. I would probably seek help from a WIN 8 forum as opposed to here. I would say do a search of this forum as there have been several discussion about that issue but the search feature is currently being searched for :(
Hopefully someone will chime in with the link on this forum to the discussion but as I said I would goto an off WGT site to get help. I would even go as far to say that I would create a seperate partition on my harddrive with WINXP Pro or Windows 7 PRO for gaming purposes.