Steam: Crash when entering the Infirmary

[KyleMac]

I have the same problem. ATI 4870, Catalyst 9.2 and Vista 64.

The level seems to actually load, you can hear it in the background, but the screen is black and then a second later it minimises and Windows shows the display driver reset message in the tray, and then if I click the mouse I get the app not responding message.

Hyperthreading and hardware sound are both off.