Wont let me on

[Eoika]

Uhhh, Do what Kadar said. Your computer taking a picture of what is on the screen currently doesn't take any real amount of power, memory or processing power (this part could change however depending on the resolution of you screen).

Anyways once you hit the print screen button, go to your start menu and find your "All Programs". Once all your programs pop up, go to the branch called, "Accessories". One this branch opens up, go to paint. Once you have paint open, go to edit and click "Paste". Then save it, and find someway to get it to the internet.

Hope you don't look at this like an insult.

tl;dr: Read Kadar's post.