Mine played fine last night running on high settings/1080p, but didn't check all the settings. It rarely went under 40 FPS. I have little doubt yours will be fine, but make sure your system resources and background clutter is cleaned up.
965BE
HD6970 (outdated drivers; no AMD support for Vista since April)
Vista 64, going to test with Windows 8.1 Pro
I'm going for a new build, but am waiting for results from multiple users to get a better idea of what I really need. Thus far a high end system isn't necessary for an enjoyable gaming experience. The Beta run IMO put out false impressions and really was a waste of time using as a benchmark.
Also, my son's HP DV6 laptop (i7 3630 cpu and 650m video card) could barely play the Beta and figured he was not going to be able to play the full release last night. It worked fine, and we both had fun except for occasional hiccups on my pc probably due to using Vista with the obsolete drivers.
Hope that helps.