When purchasing an Acer desktop back in August, the first thing I did was partition the drive and add Windows XP Home Edition. Gettting it set up was admittedly a pain, but after many hours of trial, error, and frustration (I was actually happy one afternoon when a thunderstorm came up, forcing a badly needed break), I did end up with a system that can be booted into either Vista or XP. Searching newsgroups helped immensely, particularly in helping to find some "mystery" drivers that simply showed up as question marks with very little hint as to what they were.
I also ended up transplanting a floppy drive from my old system to the Acer, as SATA drivers were demanded by Windows XP during the install process...and floppy seemed to be...