pink areas of display with nvidia geforce fx 5900 after latest windows update

I've got an nVidia GeForce FX 5900, and it has been fine for many
months.

This morning I have noticed pink dots / pink areas in many places on
the screen, usually in places where there is a specific shade of blue,
but not always.

These pink areas are not fixed on the screen, but rather to whatever
image they are appearing on. Like in my blue-shaded title bar, near the
end towards the minimize/maximize/close buttons, is a small area that
is pink which should be blue. If I move the window around, the pink
stays on that part of the window. (Just to illustrate it is not affixed
to a certain part of the screen.)

I have the latest nvidia geforce drivers from November 2004 (66.93).
This only happens when I have it in true color (32-bit mode). If I
change to 16-bit mode, it goes away. If I switch it back to 32-bit, it
comes back.

The only recent change made to my system was the installation of the 11
security updates released by Microsoft on February 9, 2005 (yesterday).
I will try uninstalling these later to find if that is the problem, but
I wanted to give everyone a heads up, and see if anyone else is having
an issue like this.