Computer virus?

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Several times when I'm viewing a page on the internet, a pop-up will appear like the ones that come up sometimes, only this one says something like, "protect your computer from hacking and viruses, get virus doctor," or something along those lines. A new window pops up in the bottom right corner of the screen, and even if you click the x on the pop-up add, it closes whatever page you were viewing before and expands the little window, showing a webpage to get the "virus doctor" thing. This has happened three times now, all while viewing completely different webpages, and all three times I have lost my work on the page I was viewing before. I've been too frustrated to write down what it says, but has this happened to anyone else? Is it a virus attack, or am I being hacked or something? What can I do to fix it?