This is, I hope, Windows 7 SP1 and you have installed, whether or not you use it, IE11? Important as some processes use IE regardless of default browser.
It sounds like you have malware onboard. Always be careful what you download, what you click on and who you let use your machine.
Scan using Getsusp, then Stinger, AdwCleaner and Malwarebytes Free, all linked in the last link below.
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