My PC might be infected by malware

[Thunderer]

Sometimes it randomly sends me to Facebook when I click something. Sometimes it sends me to a page that my antivirus blocks. The antivirus window often pops up when I'm viewing the forums, almost as often as on Skype. This started a few minutes ago.
My antivirus is Malwarebytes. I could provide more details if I knew how to find the history of blocked pages.

Edit: The word "Malwarebytes" was somehow auto-cap-locked and linked after I posted, although I hadn't provided any link nor written it in caps-lock. Then I clicked the link, and Mozilla took me to some page that my AV blocked.

Edit 2: A click on "Malwarebytes" on that page has lead me to some Russian sport betting page. I can send the link to an admin or a mod if I am asked by PM, but I don't want to expose anyone to risk, so I am not going to place it here.


Thred title edited, this might be misleading otherwise. Also moved to proper subforum™.-J

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