Every time I start my computer it stops at the BIOS screen with the following message: CMOS Checksum Bad CMOS Date/Time Not Set Press F1 to run SETUP press F2 to load default values and continue. I have reset Date/Time using F1 method and also reset it by right clicking the clock in the task bar. But next I go to use the PC it stops again at the BIOS screen with the same message and the clock has slipped back. Can someone help please and tell me what is happening and how do I correct it? Thanks in advance. IanG