Beware NVidia!

A few weeks ago, NVidia out of the blue, offered to install a new driver. Why not was my reaction, and I clicked on yes to download and then to install.
Everything on the screen immediately became so small I could hardly see it.
I tried changing the settings in Windows XP, but there was no significant change.
I tried going to the NVidia site for help, but NVidia doesn’t offer assistance.
Eventually (I’m old and dumb) it occurred to me that I maybe I could uninstall it. It worked, and things returned to normal.
Now NVidia asks me several times a day if I’m ready to install their wonderful new driver, and I say no, of course. It must have snuck onto my system.
Any suggestions about how to reach NVidia?
Andy