Do I have a virus? Security Alert Balloons and Pop-Ups...?

I'm having serious problems with my pc. I keep getting these security alerts and now have a new toolbar called "security toolbar 7.1" that I can't seem to get rid of. My computer is running very slow and most pages I can't even open. My homepage keeps coming up with various websites that prevent or get rid of viruses, spyware, and adware. It's every few seconds that I get one of these damned "security alerts" balloons from my Windows taskbar, as well. I can't get rid of the icon either. My antivirus subscription has expired and I've tried renewing it online, but the page won't even open up. It's crazy. I'll be surprised to even know that my question actually makes it through. Any advice?

Do I have a virus? Security Alert Balloons and Pop-Ups...?computers

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