If its a boot sector virus , format hd wont do anything
But chances are its just some virus to turn you into a email drone.
Unplug your internet !! Fix problem..
They always seem difficult , but they aren't , just walk thru it backwards.. And find info from someone else that has had it. I guarantee you aren't the first person , and i haven't seen a virus in years that couldn't be dissected and removed. ( without format hd )