I have a Pentium II MMX computer with Award Plug and Play Bios (1997). When I turn on the computer, I get the error message "CPU is changed or replugged, please set CPU core speed in setup". I have set the CPU speed many times by entering BIOS (and saved the new setting), but I still get the same error message every time the computer is booted (cold or warm boot). I can bypass the error message by pressing F1. A related problem is that between boot-ups, the computer does not keep time - the time at boot up is always the time the computer was turned off. Is this a battery problem? Thanks for your help.