Colour flicker/squiggles in videos/games

Hey,

Long story short, I left my PC on for a good hour and a half yesterday, monitor off with skyrim running. I get home, turn the monitor back on and start playing.

I start to notice on some cobble stones that when I move, coloured (pink, red, green, cyan) textures sort of start to flicker or remain static. The same also happens when I look at a variety of other spots. It seems to be happening in areas of high contrast, where darks become light. This has never happened before.

Now when I watch video I notice the same phenomenon occurring, I foresee that it will happen now during any sort of media that involves movement across the screen.

I am running:

64 bit Vista
Nvidia gtx 285 stock clocked, graphics drivers are the latest beta drivers, which I installed in an attempt to fix the above issue, no luck.

GPU temperatures also appear to be fine.