I have a virus -- **** sites keep popping up in the middle of what I'm doing. How do I get rid of this virus?

It is just as likely you have a bad Domain Name Server DNS reference.

System preferences > Network > <your main interface> ...

...and check the stuff under DNS carefully. They should be EXACTLY what your ISP gave you, or remove the ones they gave you and use Open DNS:

208.67.222.222 and

208.67.220.220

... AND NO Stray references!

Probably this, reported on ZDnet today:

New MAC OS X scareware delivered through blackhat SEO

The Mac Security Blog » MAC Defender Rogue Anti-Malware Program Attacks Macs via SEO Poisoning

Thomas' Corner » MacDefender in action

http://www.bleepingcomputer.com/virus-removal/remove-mac-protector

http://www.reedcorner.net/news.php/?p=138

These are both good.

I hope the OP resolves the issue.

<Edited by Host>