mnc multiplayer beta crashes after a few minutes of play

Beta Multiplayer crashes after a few minutes of play. Goes to black screen with background noise. Keyboard is locked up. Windows says program is not responding.
I've tried old, currrent and beta drivers. I've tried different video resolution settings. Turned off firewall. Any help would be appreciated. Thanks.

OS Name Microsoft Windows Vista Home Basic
Version 6.0.6002 Service Pack 2 Build 6002
System Type x64-based PC
Processor Intel(R) Core(TM)2 Duo CPU E6750 @ 2.66GHz, 2664 Mhz, 2 Core(s), 2

Name NVIDIA GeForce 8600 GTS
PNP Device ID PCI\VEN_10DE&DEV_0400&SUBSYS_048019F1&REV_A1\4&1798B537&0&0008
Adapter Type GeForce 8600 GTS, NVIDIA compatible
Adapter Description NVIDIA GeForce 8600 GTS
Adapter RAM 256.00 MB (268,435,456 bytes)
Installed Drivers nvd3dumx.dll,nvwgf2umx.dll,nvwgf2umx.dll,nvd3dum,nvwgf2um,nvwgf2um
Driver Version 8.17.12.6635
INF File oem16.inf (Section004 section)
Color Planes Not Available
Color Table Entries 4294967296
Resolution 1600 x 1200 x 60 hertz
Bits/Pixel 32
Memory Address 0xFD000000-0xFDFFFFFF
Memory Address 0xE0000000-0xFFFFFFFF
Memory Address 0xFA000000-0xFEAFFFFF
I/O Port 0x0000DC00-0x0000DC7F
IRQ Channel IRQ 16
I/O Port 0x000003B0-0x000003BB
I/O Port 0x000003C0-0x000003DF
Memory Address 0xA0000-0xBFFFF
Driver c:\windows\system32\drivers\nvlddmkm.sys (8.17.12.6635, 12.36 MB (12,959,976 bytes), 1/13/2011 6:05 PM)

wrong section