It's a message included with the latest Beta drivers form Nvidia. After I closed the pop up, it hasn't returned so I don't know.
Edit: I believe if you disable the nvidia tray in startup you won't see the message any longer: Run>msconfig>startup tab>uncheck the Nvidia tray.
Noli Nothis Permittere Te Terere!!
EVGA 680i, Dual EVGA 8800GT'S (650/950), 4 gigs OCZ DDR2 1066, Intel Q9450 at 3.8 Ghz, Koolance Water Cooled, Dual Plextor16x DL DVD+/-RW. Dual WD 250gb 16mb Cache Sata 3.0. 3DMark06 score = 19,168.