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Nancy Muir is the Vice President of Content and Curriculum for Look Both Ways Foundation, a non-profit organization committed to helping people of all ages stay safer online.
Nancy is the author of more than fifty books on technology topics, including Using the Internet Safely For Seniors For Dummies and Computers For Seniors For Dummies from Wiley Publishing. Nancy has taught technical writing and Internet safety at several universities, is the author of a highly regarded introduction to computers textbook used in community colleges, and has been a consultant to technology companies including Microsoft and Hewlett Packard.
Threats to your computer security can come from a file you copy from a disc, but most of the time, the danger is from a program that you download from the Internet. You need to be aware of three main types of dangerous programs.