That's the part of the machine that stores all kinds of basic information about your computer, as well as the date. The BIOS is referenced when a computer is turned on. Your operating system. That includes programs such as Lotus, Excel, Word, WordPerfect and other data creating applications. Finally you should be concerned about data files too.
Most newer computers have compliant BIOSes, but even some are still non-compliant.
It's easy to install from a floppy disk. All versions of Windows are susceptible to Y2K bugs. Windows 98 is the most recent operating system and has the fewest bugs. If you have a Macintosh computer running any version of Mac OS, you can also rest easy. Most reputable software vendors have Y2K compliance statements on their Web sites.