When you rub a metal surface on the PC, and it feels slightly fuzzy, a very light pins-and-needle feeling
This means__ your house's earth-ground (bottom pin of 3prong plug) isn't hooked up yet, or it was removed at some point by the previous owner, or perhaps it's not hooked up in all rooms.
If you're just getting discharges from your body TO metal surfaces, that's normal. Your air is too dry, you need a humidity system added to your furnace..