Trojan detected message while using Safari
While browsing the Internet tonight, I clicked on a newspaper link and received an Apple Alert that a Trojan was detected on my MacBook Pro. My iPhoto was open in a separate window. All photo counts on the albums were flashing and bright red and white. And a file kept appearing in my downloads. I added the files to the trash and secure emptied it.
How can I be sure that my MacBook is not infected with a Trojan virus?
Macbook Pro, Mac OS X (10.6.4)