I suppose you could try reinstalling. Also, posting exactly what the window says would be a big help.
i've reinstalled twice.
there's a line:"assertion failed"
[Edited by hayden24, 6/30/2009 10:03:00 AM]
update directx & your video card
and install the physiX
us.download.nvidia.com/Windows/9.09.0428/PhysX_9.09.0428_SystemSoftware.exe
[Edited by top_secret, 7/1/2009 12:24:09 AM]
thanks for the advice!i'd installed physX and it worked!