Have you verified that you do indeed have a grounded three wire service to your home? You can check by looking where the power lines are connected to your home, most likely on your roof. If you do have a three wire system, the correct fix is to pull a new ground wire (essentially rewire the home), or the next best is to use GFCI outlets on selected circuits, however, there will be no equipment ground and the outlets must be marked as such. Here's a link to an article that explains this better than I can.
http://www.ecmweb.com/ar/electric_re...re_ungrounded/
If you only have a two wire service from the pole, then you need a service change and a rewiring job. This can be pretty pricey and definitely requires permits, at least in my neck of the woods.
Hope this helps.
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