The most likely reason you are seeing
ERR_SPDY_PROTOCOL_ERROR alerts is because of an adware infection. You should never trust these kinds of alerts, everything they claim is false, unless the problem is completely unrelated. If an ad-supported software is indeed to blame, expect very invasive ads. If you don't pay attention to how you install free applications, it's not surprising that an advertising-supported application is installed. The advertisements themselves won't endanger your operating system, as long as you don't fall for the scam. The scammers on the other side of the phone would try very hard to fool you into providing remote access to your PC, and then try to make you believe that they have fixed the issue (which doesn't even exist in the first place), for which they would charge you a lot of money. Bear in mind that you should not allow some weird tech-support to remotely access your system, especially when their advert appears in your browser. And if you are still concerned about the warning you are getting, it's false, and your device is secure. If you want the adverts to no longer appear, all you need to do is erase ERR_SPDY_PROTOCOL_ERROR.
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