OT - Ding Dong, the Wicked Worm is dead...

[Suicide Junkie]

Pictures don't get run, so there would be little point in a virus infecting one of them.
Mostly system files or newly created files that look like system files. Or programs like iexplore.exe so the virus is activated when you browse the internet.

All you really need to do is install your antivirus software first, and make sure its updated. It will then scan the files you copy back. You can scan your CD first if you feel like it.