I recently did a clean install of my home machine and I am having a weird graphical error where if I move one window across the top of another it leaves a trail. Here's an image: http://i.imgur.com/Z9Li3.png
I have the most recent nVidia drivers installed and nothing new is installed on my machine than before the reload (and I never had this issue before). I have two monitors and it happens on both so I'm sure it isn't a hardware issue (the card and my main monitor are also both less than 6 months old) I've also noticed a ripple when scrolling down on web pages which I believe is related.
Any ideas what might be causing this and solutions to fix it?