Bought my wife a midrange laptop a year or so ago - loaded with XP Pro 'cos that's what she wanted. Runs mostly GPL software (OOo, Thunderbird etc etc.).
Main pain is Windows patches that breakthings and Norton's intrusive AV.
If I could do it all over again I'd (wait for it......
.......wait for it!
almost....
..........I'd buy her a Mac.
There, that's quite a confession from a Linux fanboi.....