Today a customer brought in his desktop. He had been tricked by a fake flash player advertisement and downloaded a malicious setup file and ran it which infected his machine pretty badly. both his Internet explorer and Firefox browser’s were hijacked as you can tell by the fake blue screen error website ! You can protect yourself by not reacting to solicitation. Just like you would turn down the solicitor at your door you need to turn down the solicitors on the Internet selling you snake oil. You should question the motives of every link on the internet. It also helps to be informed. As of Internet Explorer 11, the current browser, flash player is built-in so you do not need to download flash player separately from any website let alone a malicious one.
Stay safe and happy browsing!