Sounds like you might have some adware, malware installed on your PC, download and install the free version of Malwarebytes Anti-Malware, and run it before you try reinstalling windows, it should correct your problem. It won't hurt your computer in any way, I promise, it can only help.
Malwarebytes : Malwarebytes Anti-Malware PRO removes malware including viruses, spyware, worms and trojans, plus it protects your computer
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