From SecureNet Technologies:
Many PC's in use today are operating with a Real Time Clock (RTC) that is defective with respect to dates 2000 and beyond. The consequence for PCs in this condition is a failure at some time on or after midnight December 31, 1999. This software package will test your PC and will explain whether or not your computer will pass into the year 2000 without any problems. If your computer fails the test, SecureNet offers Y2K FIX software for a fee of 20$ per PC.