why do some websites freeze my computer

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Dear forum, All day long it's a struggle to get my computer to work normally. The problem is that, when I open facebook to log myself in, the entire computer freezes.

The same happens when I try to play a certain browser game from KABAM. Other websites work perfectly, including youtube and webcasting sites. The problem does not lie with Google Chrome, cause the exact same thing happens when I use Opera or IE. So it's not about my extensions. I also tried shutting down my ZoneAlarm Extreme Security, didn't help neither.

The only moments when it sometimes seems to work is when I start my computer, erase computer and browser history through both CCleaner and chrome itself, restart my computer and try to log into facebook through a different login page. But it only works after my computer has been running for a few hours.

And even that doesn't guarantee that it would work. Nothing works anymore when it freezes, including CTRL+ALT+DEL and buttons don't light up anymore when i hover over them with my mouse. When there's sound playing, it plays for another 4 seconds after the computer froze and then it stops too. That's all the info I can give you.

I honestly don't know what to do. I ran a scan with Trend Micro Housecall, it didn't detect any viruses. It's been going on for a few days now. If it's a specific website on no matter which browser, maybe it's something with Java or ActiveX or whichever plugin it uses? It's the only thing I could think of, but normally they update automatically.