Is there any way to stop my GS3 from charging when connected to my PC ?

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http://forum.xda-developers.com – There's something wrong with my PC,it gives me electric shock when I touch the case.And when I connect my usb cable with it,I can feel the electric shock on the other end.Once I plug the cable in my gs3,I can feel the electric shock on the pins that connect with the battery.That's the only place I feel it since the gs3 is luckily made of plastic.I don't want to repair my PC because I will be changing it soon anyways,I'm only worried on my phone.Can this damage it in any way ? I have been doing it for a month and nothing happened but I'm afraid something would happen,I don't keep it for long ti (HowTos)