These are the same as BIOS settings. They are the basic settings that get the computer started before Windows is loaded. The BIOS is in flash memory, and the settings for it are stored in memory known as CMOS. These settings are maintained by a battery. If they are wrong, you can restore them to the safe default settings, and then adjust them to your requirements.
It's a small program that starts your computer consisting of several bit of software that recognises you hardware before it load’s the Operating System. When you start the Computer it will say on the Black Screen something Like "To Enter Setup Press Del" for the Delete Key. You may try resetting the Default settings to see if it will start
For most purposes the default values are ok. If you want to adjust them, it's best to obtain the motherboard manual. If you don't know what moptherboard you have, download and run AIDA32 from click here. You should be able to get a battery from any computer accessory supplier. Otherwise you'll have to open the case. The battery is a silver coloured disk about 20mm diameter.