Why does my computer screen turn of when I play certain PC games?

Why did my pc say someone else was logged onto this computer when i went to restart it?

• I went to restart my pc and when i hit turn pc off it showed a msg that other people were logged on to this computer do I want to save their work. This is the first time I have ever seen this. Also does anyone know why some of my club pogo games will load and i can play and other wont load when it gets to the screen where the game is loading it takes forever and when i try to close it out it will give me a not responding error and i have to end the task which closes out all my browsers. Thank you for all ya'lls help.

• Answer:

  I dont know what operating system you have, but it sounds like you have multiple user accounts. Do you have other people living in your house with a seperate account? It could even be you, for example if you clicked on a different user at startup. My guess is that some of your club pogo games may require more video card memory than what you have on your computer. I also suggest you will improve your performance by good maintenance: run disk cleanup and disk defrag reg, for example. If your computer is running slow, it is often a sign of a virus.