H'mm my sandy 2500k not supported WTF.
Well initially it was overclocked and win 7 got it wrong by stating the speed was 5.9ghz and thought that could be the problem so reduced the speed...still cpu not supported. Anyway checked on the net and it is a problem for some computers, so made sure I downloaded all updates and checked to make sure updates were working.
Problem not solved so unless MS come out with a fix for my computer then I'll have to stay with win 7.