i have complete xp drivers for my toshiba laptops delivered with vista as default. true, they ran like, well i used my pocket pc more than the lap, that's how they ran. toshiba don't offer a complete set of drivers for the laptops but you can compile them from sources yourself with some hunting around. (took me two days). i did love the practice slipstreaming drivers though.
remember once the op system was superceeded, in theory agreement with toshiba as a partner prohibited them from supplying drivers to downgrade their vista supplied laptops. the period for allowing downgrading from oem suppliers ended long ago.
the only thing i could suggest to the woman in question would be "good luck with that". vista crippled a lot of otherwise good units especially laptops but if someone offered to downgrade for you at under 60 bucks, you would think she would be giggling with glee.