that didnt sort it unfortunately! i have considered a reinstall but im reluctant to do it as on my laptop it puts all the drivers etc back to default which is a bit of a pain,
See the link i gave above, a repair install does a different job to plain reinstalling
I've seen the exact same thing on my PC before now, it fortunately sorted it's self without any inout from me.
Before a possible repair install, try entering the advanced boot options (prob. F8/F12 etc.) and choose 'Last known good configuration'. that may do the trick.