Welcome to Troubleshooting Tips!
Camera light turn on?
You probably have some malware or spyware.
First things first. DON'T FREAK OUT! This is easily fixable and nothings to stress over.
Download some anti-spyware software. Use it. Type Alt+F4 instead of clicking on pop-ups. Update your computer software. Tell someone. If the problem persists contact your service provider.
Also, here is a video from the 21Things 4Students website to help you understand troubleshooting a little better...
Also, here is some other tools that can help you in your troubleshooting journey!
You should also take a closer look into Thing #8!