Windows freezes for unknown reason when Youtubing

My computer freezes about once a way, and usually when I'm watching YouTube videos.

Here's what happens:
1. Watching YouTube, suddenly whole screen freeze (like the explorer.exe froze), cannot press anything with mouse, the video is still playing in Chrome.

2. However, I can still alt tab to switch between tabs and other applications working.

3. If I ctrl+alt+delete, screen blacks out, and mouse becomes the loading icon, and I cannot do anything to get my screen back.

4. I have to press the power button, when I do that the monitor stops receiving signals from the computer instantly. But even after that, I can still hear the YouTube video playing.

5. Then I have no other options other than force shutdown.



Fun fact, when it freezes I can still use windows key + tab to look at other tabs, but if I switch to that tab then that application freezes after like 5~ sec too.


It seems like after step 5, all my applications is still working normally in the background but I cannot do anything but force shutdown.

And I can use my keyboard's media play key to turn music on/off after it freezes.

Can someone please help? This problem is starting to get annoying.

Thanks.

is this also happening in other browsers like ie or firefox? it may just be the flash player that needs fixing or an update.