I don't know what the minimum requirements are, but I would think if your cpu is a single core 2.7 and higher would be good, if running a dual core 2.2 and up .
for RAM I would think 2GBs +.
and a video card generation 6 and up, keep in mind these are just a guess from me,so don't take them as legitimate.
what are your system specs ?
sorry Alan didn't see you there when I started my post.