Did you install the 12.41 over the previous 12.60 drivers?
Or did you uninstall the 12.60 drivers first from add/remove, then reboot and install the 12.41 drivers?
I've noticed that some driver versions come with extra stuff whereas other versions don't, what could be happening is that you haven't uninstalled the 12.60 drivers before installing the 12.41 drivers and there are some resident files left over from the 12.60 drivers and thats why its saying it isn't WHQL certified.
And so its seeing these non-certified 12.60 resident files left over and its telling you the drivers aren't certified.
Just a guess though.
You could check out
www.geforcefaq.com that usually has the answer for just about anything GeForce related.
You could try a total uninstall of your drivers then a install of the 12.41 drivers, see for this.
BOB