ATi Radeon 7000 driver issue

Whenever I try to update my graphics driver newer than version 6.14.10.6368, i have a problem with video playback.

The videos, any kind of format (avi, mpeg, mov etc.) cannot be played on any video-playing application, be it media player, winamp or whatever. Then, the system hangs. I have to reset the system.

Till now, I have been using the same old driver (6.14.10.6368).

Please help.