I'd do a custom install rather than upgrade also, you will need to reinstall stuff as white mentioned, make sure so your cousin gives you the serial and that he hasn't used it already, otherwise, some features might feel abit different than with vista, but you'll get used to the new stuff in no time. Myself i would easly upgrade it, unless you have a really old (several years old) printer or something, there should be drivers released by now. Btw, i'd say install the 64 bit unless you got low ram, like, if you got more than 2-3GB of RAM, install the 64 bit.