im looking into a tablet with a ssd and the option of xp home(but id upgrade to tablet edition) or windows 7. the ssd that is included is either a 16gb or a 32gb. my question is how much actual space is really needed to install these OS'. i know w7 needs 15gb for 32bit but does it really need all 15gb? because then a 16gb would only fit the OS and nothing else