What other problems, besides breaking the law, can you have if you use file-sharing programs?

One big risk with file sharing programs is that they automatically make you a part of the sharing network, meaning people can upload files from your PC.  If you make a mistake, you can easily give people access to other information on your hard drive, like your tax returns, email messages, medical records, photos or other personal documents that could be used for identity theft.  Another common problem is that you can unknowingly download malware labeled as something else.