This topic has been discussed in many threads here. The best solution is to have the house or apartment/flat wired correctly. This provides safety for all your electrical appliances and people in your household. The other solution is to just live with it as is. You might get a little shock or a little tingle when you touch the PC case sometimes. No, it's not fatal for you or your PC. More like if you touch a 9V battery. When you feel this is very dependent on the relative humidity, flooring, socks, etc.