I don't know much about this game specifically, but I think they mean a processor that comes standard at 3.2 GHZ.
If you tell me your motherboard, I might be able to tell you if there is a cheap processor that will fit in it and which is at least 3.2 GHZ by default.
I don't think the one you have will be able to do what is required, even if you could make it reach 3.2 GHZ, but I would like to at least help you to find out if you could get one that would work cheaply and easily.