I don't know if this will help, but I had a PC that would hang on certain sites just like yours. It was a real pain. I tried switching the video settings, updating the browser, disconnecting the sound card, etc. and didn't do any good. Sometimes the sites were fine, but if there was a particular ad it would kill everything. Otherwise the machine was fine. Then one day I swapped some ram dimms and put a higher quality (100mhz cas2 micron) in even though I was running it at 66 and the same ram from that machine that would hang worked fine on other machines at 66 cas2. The machine has been rock solid ever since.