Inappropriate Downloads

My poor co-worker - I'll call her B. She was letting another co-worker, F, check her e-mail using B's computer. F had to download some pictures that someone had sent her. She downloaded the pictures, and then was scrolling through to look at them. All of a sudden, a picture of a naked man was in her face! She called for B, who almost had a heart attack. They then called me (the computer expert, how scary) to see what had them screaming. I realized quite quickly that the pictures belonged to R, a former co-worker whose computer B had inherited. The things people download at work...B is still recovering from her shock.