Help, WMP and DivX webplayer freezes!

Hi all, i have a problem with my HP pavillion dv2419us computer with Vista 32bit, everytime now that I watch HD videos online streaming or even off my hard drive, my computer completely locks up after about 15 mins. I sometimes get the com surrogate error on my comp, but i dont know what to do about it. I also tried to update my GeForce Go 6150 graphics driver but it doesn't work. The driver im using now is from 2/27/2007, it's 7.15.10.9815 but on the hp support website there's a driver from 5/2007 called 7.1510.9815 A. Everytime after I install it I restart the comp but the driver is still the same one i had previously installed. Will updating my driver even help? Do i need codecs or something?