After being on vacation for a week, I booted my computer and windows failed to load. I got the message CMOS Settings Wrong, and CMOS Memory Size Wrong. I accessed setup, made no changes, then exited. Windows then loaded and detected new hardware which I have had installed for quite some time. After that I had no sound, none of my cd drives would work (would detect the files but not access them) and A: drive not detected at all. I rebooted and then had setup restore default values. Only the A: drive would work after that. After quite a few hours of searching the net I rebooted to obtain the AMIBOS ID String to flash the BIOS and then everything loaded properly and all my drives and sound worked fine. I am not a computer wiz by no means but I think I may need to replace the CMOS battery to obtain it's settings. If so what is the best method to do this, or is something else going on with the PC.