right click "my computer", properties, click the "hardware" tab, go to device manager, click the + beside "display adapters" right click your driver, go to properites, find the "roll back driver"
The new drivers adjusted the color correction settings for overlay.
This is how you can fix it.
start -> control panel -> display -> settings tab -> advanced -> GPU Tab -> color correction drop down.
For the "Color Profile" drop down, change it from "Standard Mode" to "Advanced Mode".
In the "Apply color changes to:" drop down, select "Overlay". You should see a straight line.
This is a common problem with the new Nvidia drivers. Make sure you are using Hardware Video Decoding and Hardware Color Acceleration. I haven't fixed this myself, but I troubleshooted it for a friend over AIM, and he said enabling those two things fixed it.
For those who immediately suggested he roll back drivers, you are smarter than that....think about these things before you post.
The new drivers adjusted the color correction settings for overlay.
This is how you can fix it.
start -> control panel -> display -> settings tab -> advanced -> GPU Tab -> color correction drop down.
For the "Color Profile" drop down, change it from "Standard Mode" to "Advanced Mode".
In the "Apply color changes to:" drop down, select "Overlay". You should see a straight line.