But when you run the new program you just found, it can do anything from popping up a message to erasing your hard disk, as the rogue PKZIP utility really did.
What it does then depends on the malevolence of its creator.
Some viruses are nothing more than a practical joke.
Or the credit card processor Card Systems Solutions which may yet go out of business from major security breach at the company's Tucson, Arizona, operations center.
In a recent consumer survey among security breach victims, people don't take lightly the loss of their data.
Unfortunately, 'keeping it current' means updating it weekly, at least but most products today allow one to automate this process, but file downloads can be large and slow.