Computer freezes when playing games or watching video on youtube

Hi everyone, pls I need help, I have problems with computer freezing when I watch video (youtube, movie in bsplayer) or when I play games.

My specs:

Motherboard: Asus P5Q PRO
Graphic card: Nvidia geforce 9400GT
Ram: 2x Kingston 1G, 2x Kingston 512MB
Intel core 2 quad q9400
PSU: ZM600-LX
Win 10 64bit

Any suggestions?

Thx
 
No reputable manufacturer would sell a system running 64 bit Windows 10 with less than 4 Gb ram and 8 Gb would be much more acceptable. Maybe it has other issues slowing things down. I'd either install a 32 bit version of W10 or splash the cash on a decent amount of ram. Upgrading the graphics card might help too.
 
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