"fixme:imm:ImmGetOpenStatus (0x142b98): semi-stub " - I have millions of such messages in debug log :). I've noticed that sims use quiet large amount of RAM, and there are memory leaks. May be they cause crashes. Also try to install lastest directx via winetricks (but you should to download lastest archive from windows site, because my winetricks install november 2008 directx).
