A checksum error can be solved by stopping your PC, pressing the appropriate key like Del or F2 to enter the BIOS and saving the changes. Once you are in, pick the main settings on the screen, press save and leave the game room. If the problem keeps happening, switch off the PC and leave the CMOS battery out for a couple of minutes and put it back in afterward using a new battery. This changes all the settings in the BIOS to their default values. In cases where the problem does not fix, a broken motherboard might be the reason, so professional help is recommended.
