I am having keep cra a video playback. I have already cleaned my computer with the help from the internet security thread section and they told me to post my problem here. I am currently using a windows xp. What should I do? Thank you

My computer keeps crashing when I start a video playback. I have already cleaned my computer with the help from the internet security thread section and they told me to post my problem here. I am currently using a windows xp. What should I do? Thank you