PC: Dell Inspiron 530
CPU: Intel® Core™2 Duo CPU E8500 @ 3.16GHz × 2
OS: Ubuntu 12.04 (32-bit)
GPU: EVGA nvidia GeForce 210
Dirver: 304.64
Direct Rendering: Yes
Sync to VBlank unchecked in nvidia settings.

When playing and video with Totem and Kaffeine my system freezes, the only thing that works is the mouse.

I have to power down the system by holding in the on button for 5 seconds.

I can play video using mplayer so I suspect it is an issue with gstreamer.