White screen/black screen..help!

Flashplayer was working but I am having a problem tonight. I am getting a white screen on TV channels and black on you tube. BBc iplayer has a loading wheel all other channels are white. You Tube is black and says error and other videos ie on Facebook are showing as a white box. I have windows 7 and have got Flash player installed. It was working earlier. I have done a system restore in case there was a problem with my laptop.