I can supply you with XP at the weekend IT hapens to be my bread and butter Motherboards are common on Acer i have replace a couple for friends they are very good PCs though
Also 4gb RAM min in Vista PC i recommend i have it and it just works how i would like it
I have just got a macbook blows the PC out of the water, still use PC's on a daily and have them at home but lovin the Mac experienceTBH vista really isnt that bad. Its a bit different and it needs a decent amount of RAM to run nicely but then XP was exactly the same when it was released.
The problem however is that a lot of companies are selling it on machines that basically cant run it properly. Mainly because Microsoft has discontinued XP and therefore only Vista is available for new machines, regardless of their capabilites.
Any vista machine needs 2gb of ram to run nicely, and i'd also recommend a dual core CPU as a minimum.
At the end of the day, if you try to run XP on a P3 with 128mb ram (which were still being sold when it was released) it'll also run like a sack of crap!
Seems in this case its actually a hardware failure anyway, so not vistas fault at all!