can your motherboard take it? is it the same as your old one?...if the questions asked are true...switch of the pc from the mains...* CAUTION IS NEEDED HERE*>touch the case unscew the case and with a clean cloth or rubber gloves place the ram stick in the bank next to the old one..and re-screw the case back on and power up the pc.. if you are unsure and dont feel confident in doing this....get someone that is...