Changing the subject backwards, for a while win2K would crash on printing, this seems to have settled down and AC is again stable on win 2k.
I started on AC in 11/02. Initially I had several 400 to 450 used computers in the rooms and front desk. I still use 2 of them, one for faxes, the other, as I said, is in the lab. Usually my MA puts the vitals in from there.
Win2K is faster than XP is faster than Vista (is there a trend going here?)
I have run AC on XP on a 450 (hows that for acronyms,) but it gets kinda slow, on win2K is runs fine.
If it ain't fixable I will keep using it until I find something else cheap and functional. Most of my other computers are in the 2K range, but AC does not require a lot, even though I think the recommendations are something like 1.5K machine.