Does what I'm describing sound like a computer virus to you?

First, what happened yesterday: I clicked on a link in an email that someone sent me. I think this person’s email account has been hacked, because this was the second time I received something fishy from him, and I know it’s not him. (the first was links to a prescription med website, this was some computer site) and once I clicked on it, my computer McAfee security had the red symbol indicating it’s a bad site. OK that was yesterday. I had nothing weird happen to my computer. I use Mozilla Firefox if that helps.

Today, I can’t sign out of my AOL account. I have another email address, for my daughter (used for party RSVPs) and I can’t sign out of mine in order to sign onto hers. Even when I x out of it and google AOL, it opens with mine, and yet again, I can’t sign out.

To clarify what’s happening, when I click on “sign out” it says “signing out” and then it opens again automatically with my same homepage, as if I never signed out.

Why would this occur? Does that sound to you like something fishy is going on?