Hi,
For several months now my GRAPHIC and SOUND (both together and separately) have been getting more and more jittery. The problem is unusal because it happens intermittently. Approximately every 2 minutes the sound and / or graphics will become jittery for around 30 seconds. When I go and look at the Processes tab in Windows task manager while this is happening the CPU usage percentage is high (75 - 90 %) for whatever graphics or sound program is in use (firefox (playing youtube vids), and itunes are particularly problematic), this will then drop back down to zero after 30 seconds.

I have:

Nvidia GeForce 6150SE nForce 430 (I THINK intergrated) graphics card

An AMD Athalon 64 x2 Dual Core Processor 6000+

Windows XP Professional Version 2002 Service PAck 2

3.01 Ghz, 1.87 GB of Ram

Hope someone can help.

:-)Also, one other thing, I have installed the most recent driver for the Graphics card and it is still problematic. Reinstall drivers for both sound and graphics. Also try disabling the sound, just to see it the graphics still run jerky> Start>CONTROL Panel>System>Hardware>Device Manager>sound+>Right click and disable.