sorry, I don't mind ubuntu at all but windows is not all that hard to administer if you set it up right, especially if it's only a single pc. Just install it on a virtual machine on a linux host if necessary so you can restore it from time to time if need be.

Apart from that, the main advantage of windows is that all the "popular" apps and peripherals in the senior citizen crowd (think of, web-browsing, photo viewing, photo-printing, web-cams etc.) are much more readily available for windows than for linux.