sometimes the screen blinks black just once really quick and it crashes or sometimes freezes and i gotta restart computer this has happened on a browser game it goes black and i have to re open page also a couple games on my comp freeze but i still get sound is this my graph card or what?

Check to see if the fan has went out on your video card. Overheating or overworking of your card can cause black screens due to the display driver shutting down, or can cause serious graphical glitches.

You can also try either upgrading or even downgrading your drivers.

uhh im not really sure how to even open my computer :l im no good at that stuff even if i could open it i dont no what im looking for a friend set it up for me