Crashing

When I play the game, it crashes every few minutes. I have no programs running in the background. My graphics drivers are the latest ATI drivers (although from the information below, it looks like a sound issue, but those drivers too are the latest version from Creative).
The log files don’t look like they’re much help, but I can give you call stack from visual studio.

Unhandled exception at 0x7d6210c8 in Democracy.exe: 0xC0000005: Access violation reading location 0x00000000.

ntdll.dll!7d6210c8()
[Frames below may be incorrect and/or missing, no symbols loaded for ntdll.dll]
ntdll.dll!7d620ea5()
ntdll.dll!7d61f5e5()
dsound.dll!73e5287d()
Democracy.exe!0048165e()
Democracy.exe!0047d51a()
Democracy.exe!0046d0ba()
Democracy.exe!004649d5()
Democracy.exe!0046322a()
Democracy.exe!004630ae()
Democracy.exe!00431eee()
Democracy.exe!0048d88b()
Democracy.exe!00432518()
user32.dll!7d9504ae()
Democracy.exe!00448647()
Democracy.exe!004814ac()
kernel32.dll!7d4e992a()