Ati radeon 4650 driver error

Hi,
I keep on having this error for a while now. Every time I open a full screen game, this message appears and it interrupts the game I am running. Sometimes it shows up immediately after opening the game, sometimes it lets me run the game for about an hour before it happens.
Aside from that, I also see the same error whenever I open the driver control panel. I tried to reinstall the driver 3 times, completing the process and rebooting the computer afterwards, but it's still the same.
ERROR MESSAGE: 'Could not load file or assembly 'MOM.Implementation' or one of its dependencies. The system cannot find the file specified.
I hope you'll be able to help me with this.
Thanks.

