Here is the case with most "malware" warnings. If it comes up as a page that says the warning - most likely it gives you the option to clean your computer. Never click on this, the site is a fake and likely phishing site. The only way to trust the malware warnings are if they come up from an anti-malware program you know you have installed. Like Malwarebytes. If it came up outside of this it can mean two things: Either you have spyware already on your computer and something is triggering the spyware to give you the fake warning or one of the sites you linked to has the spyware. If you get the warning, don't worry, don't panic, just close the page and leave. There are very few (if any) sites that can install malware on your computer without you doing something more than just going to the site. I hope this makes sense.

Suggestion: If you suspect malware and your av (antivirus) has not caught it, download rkill and then malwarebytes. rkill is a tiny program that will kill the rootkit processes that are running (but doesn't remove the offending malware) as soon as that is finished scan with malwarebytes (or av of your choice, of course but I recommend malwarebytes) and it should find all the spy/malware and get rid of it.

Sorry for the ramble. Just trying to help
~S4