I responded to this same post in the tailgate thread.
I had the GeForce 7100 in my test PC and struggled with it for quite some time - I just don't think NVIDIA has any plans to "quickly" create drivers for these older on-board cards. Since mine was a desktop, I ran over the Fry's and purchased a new GeForce GT 610... ($40)
Your 6150SE and my 7100 use the same driver set, they did have a Windows 8 driver, so maybe they will create a new one... That said, they are pretty old and weak graphic cards, so if you can, you might want to consider upgrading.
You should be happy they did the validation or you could have upgraded and been stuck with the default Windows VGA driver.