A CR2032 is a battery that attaches to your motherboard. The CR2032 is the complementary metal-oxide semiconductor (CMOS) battery, which is used to save your basic input/output system (BIOS) settings. If your CR2032 has gone bad, it is time to replace it with a working battery. Removing the CR2032 from your motherboard will require the use of a screwdriver, and will take about 10 minutes to complete.
Turn off your desktop computer and remove the power cord.
Remove the side of your computer case by removing the two screws in the back.
Examine your motherboard and locate the CR2032 battery. You will find it usually on the left-hand side of your motherboard.
Pry the battery out with your fingers and remove the CR2032 from your motherboard.