Do you have the latest version? http://sites.amd.com/us/game/downloads/Pages/radeon_win7-64.aspx
Yeah i've got the latest drivers.
Anyway guys, i've sorted it out.
It was the graphics drivers. when i updated them via steam something must have gone wrong.
I rolled them back but that was no good, so i decided to do a quick re-install of Windows 7, that sorted things out.
Everything looks, and plays, a lot better now, and Skyrim is an absolutely amazing game. Thanks Bethesda!
Thanks for the help guys. Kudos!
