call of duty blackscreen

hi i work at a lan center and we got call of duty 2 on our pc we got windows
XP and randomely call of duty 2 put a blackscreen on our computer and its
freeze (only in when the map load ) in multiplayers.
our computer is:

Windows: Windows XP5.1 (Build 2600) Service Pack 2
Internet Explorer: 6.0.2900.2180
Memory (RAM): 2046 MB
CPU: Intel(R) Core(TM)2 CPU 6600 @ 2.40GHz
CPU Speed: 2381,4 MHz
Sound card: SigmaTel Audio
Display Adapters: NVIDIA GeForce 8800 GTS | LogMeIn Mirror Driver |
NetMeeting driver | RDPDD Chained DD
Screen Resolution: 1280 X 1024 - 32 bit
:
Network Adapters: Broadcom NetXtreme 57xx Gigabit Controller - Packet
Scheduler Miniport
CD / DVD Drives: D: TSSTcorpDVD-ROM TS-H352C | E: Generic DVD-ROM | F: AXV
CD/DVD-ROM | G: AXV CD/DVD-ROM | H: AXV CD/DVD-ROM | I: AXV
CD/DVD-ROM | J: AXV CD/DVD-ROM | K: AXV CD/DVD-ROM
:
COM Ports: COM1
LPT Ports: LPT1
Mouse: 7 Button Wheel Mouse Present
Hard Disks: C: 232,8GB
Hard Disks - Free: C: 162,2GB
USB Controllers: 5 host controllers.
Firewire (1394): Not Detected
:
Manufacturer: Dell Inc.
Product Make: Precision WorkStation 390
:
AC Power Status: OnLine
BIOS Info: ATAT COMPATIBLE 032907 DELL 14
Time Zone: Eastern Standard Time
Battery: No Battery
Motherboard: Dell Inc. 0DN075
Modem: Not detected