I watch videos on websites and video podcasts. When I do, the video is choppy and looks more like a series of still photographs, but the audio works fine during this time. I have a cable modem, a iMac 600 mHz G3 with 640 mb SDRAM, and I am running 10.4.9. Also, I have 25 GB of space available on a 40 GB hard drive. Can I do anything to remedy this problem?