The stories at the links below are just two examples of the dozens of articles I get every month.
Trove of 68,000 stolen logons in hands of 'amateur' hackers
Chuck Norris botnet karate-chops routers hard
The second article is particularly troublesome for small business and home computer users. Few reset the DSL or cable modems default administrative password, something that everyone should check.
The Internet is a dangerous place. Be sure you and your company are protected. And if you are on a business computer, or access financial or business data from your home computer, then protection should be redundant and up-to-date. You can't be too cautious! If you don't know for sure, contact a computer professional and ask for help.