Do your outlets not accept three-prong plugs?
Answer - The third, or grounding, prong on a typical appliance plug provides an extra measure of safety against electrical shock. Older two-prong receptacle outlets, installed in homes before this innovation, may not be adequately grounded and should be upgraded. There are two methods of performing this upgrade.
One is to replace the 2 prong plug with a GFCI receptacle outlet. This provides the needed safety and meets most electrical codes for upgrading wiring devices. This is most likely the most economical method.
The best approach is to run a new branch circuit back to the panel, verifying presence of a valid ground. Because this procedure usually involves fishing cable behind walls it's not always feasible unless a total rewiring job is being performed


