Hi Qasim, buyNsave adware is known to install additional applications which reinstall this potentially unwanted program if not removed. When in Control Panel be sure to uninstall "BuyNsave", "YoutubeAdBlocke" and any other recently installed suspicious applications. The next step would be removing BuyNsave plugins from your Internet browsers. After the plugin removal be sure to reset your Internet browsers to default settings. The last step when dealing with this adware is scanning your computer with Malwarebytes Antimalware and Spyhunter - both are capable of detecting and removing BuyNsave adware. You can also try using AdwCleaner https://toolslib.net/downloads/viewdownload/1-adwcleaner/