Streaming from the net freezes my computer!!! help

eaach time that i go to a site to watch streaming videos, as it tries to load, my computer freezes. andi have to restart, can anyone help. it happens with every type of movie on the net.

lm having the same problem for a week.l changed the harddisk with a new one and l also run the Ram diagnostic. evertyhing is fine with hardware.. lastly l have checked the temperature of my CPU but there was no problem at all.one reason remained is the configuration of VGA. mostly video graphic card adjustments cause this error. try to change the adjustments of your graphic card from controlpanel->screen->adjustments->button next to troubleshooting->troubleshooting then decrease hardware acceleratýon one tick until it works fine ..