Peer-to-peer (P2P) file-sharing allows users to share files online through an informal network of computers running the same software. File-sharing can give you access to a wealth of information, but it also has a number of risks. You could download copyright-protected material, pornography, or viruses without meaning to. Or you could mistakenly allow other people to copy files you don't mean to share.

If you're considering P2P file-sharing:

• Install file-sharing software carefully, so that you know what's being shared. Changes you make to the default settings of the "save" or "shared" folder might cause you to share folders and subfolders you don't want to share. Check the proper settings so that other users of the file-sharing network won't have access to your private files, folders, or sub-folders.
• Use a security program from a vendor you know and trust; keep that software and your operating system up-to-date. Some file-sharing software may install malware or adware, and some files may include unwanted content.
• You may want to adjust the file-sharing program's controls so that it is not connected to the P2P network all the time. Some file-sharing programs automatically open every time you turn on your computer and continue to operate even when you "close" them.
• Consider setting up separate user accounts, in addition to the administrator's account, if your computer has multiple users. Limiting rights on user accounts may help protect your computer from unwanted software and your data from unwelcome sharing.
• Back up data you don't want to lose in case of a computer crash, and use a password to protect any files that contain sensitive information.