Correcting A Slow Computer Clock You probably have noticed the little digital clock in the bottom right hand corner of your Windows desktop.
Some people notice that their PC clock is suddenly behind by a few minutes or more.
The first step to determine whether it is just set wrong or actually lagging is to reset the clock by double-clicking on the clock and entering the correct time. Watch the clock for a few days and see whether it stays correct or continues to fall behind. If it still continues to lag, then the reason might be a dying motherboard battery. The time is stored in a little chip on the motherboard and that chip is powered by a small battery so it can hold the stored settings even if you turn your PC off. When that battery gets low, the first symptom is usually a slow clock.