You don't need to partition unless you want to. You currently have two partitions. one is your C drive, the other is the hidden system reserved partition. Do not delete the system reserved partition or you most likely won't be able to boot your OS anymore. If the C drive is your OS drive, then don't delete that either for obvious reasons.
thankyou hawkeye22, do you reccomend have a extra artition anyhow for data ect. or is there no point if im going to back it all up an external hd?