hi, i have exactly the same problem .. i use windows xp service pack 2 as my os .. i tried to use the right click and the ctrl + c , it didn't work , however everytime i restart my comp .. it did work again ( copy & paste ) .. my question is : why does this happen to my computer ? is it possible .. that i have an os failure .. ore something .. or that my comp is infected by some kind of virus btw .. i have .. installed norton .. as my companion...