Hey my cpu won't let me close a window on the internet. Can someone please help me?

Fire up task manager and end process on it.
Kills everything

If the window is in full-screen mode, press F11 to exit full screen. You can also press Alt+F4 to close a window. If those do not work, then Curlyben's suggestion of using Task Manager is bound to work. You can access this by pressing Control+Shift+Escape. Click on the name of the window you want to close, then choose "End Task." If that does not work, you can right click on the name of the window (in the Task Manager), and choose "Go to process" then click the "End Process" button.