http://www.ati.com/support/infobase/4291.html
ATI.Com wrote:Call of Duty: system hangs or VPU recover error messages playing game
This issue affects the following configurations:
RADEON 9500 Series
RADEON 9600 Series
RADEON 9700 Series
RADEON 9800 Series
CATALYST 3.8 and later drivers
Some users have reported that after the game is launched, the system may hang or produce a VPU recover error.
Other boards may be affected.
A future CATALYST release is expected to address this issue. Further information will appear on this page as it becomes available.