Internet Explorer Will Not Close

Problem: Internet explorer is open. You want to close it by clicking the red x in the upper right hand corner of the screen an it won't close. The only way you can close it, is by Ctrl>Alt>Del and then ending task.

Solution: I fixed it by going to Tools > Options in internet explorer. Then clicking the Advanced tab. Scroll down to where you see "Enable Third Party Browser Extensions", make sure this is unchecked. Depending on which version you have, you will either need to restart internet explorer or rebooting your computer.