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BIOS
The BIOS (for Basic Input/Output System) is software that's hardwired onto a PC. It controls system basics such as display, keyboard, disk drives, and more.
Microsoft says some BIOSs--particularly those created before January 1, 2000--may not be able to take full advantage of Windows XP's hibernation and power management features.
Fix-It Tips
In some cases, a BIOS update will provide support for Windows XP. Check with your system vendor to see if a BIOS update is available.