Anonymous wrote:OP again. Thanks for looking into it. I think it might be an ad. I'll pay more attention.
I've done everything my antivirus program told me to do, so we will see if it happens again.
On a side note, do you recommend a particular anti-virus software?
Honestly, I run Mac OS X without any anti-virus software. I've never used anti-virus on Mac OS X and never had a malware problem. I will say for those who are not computer savvy, or are very gullible, anti-virus software might be necessary. But, for otherwise, it's not on OS X.