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Secunia’s PSI is a free computer security solution which, by updating insecure programs, helps safeguard the data on your PC against cyber criminals. Simply it is a computer scanner which identifies programs that are old and, if left without updates, pose a threat to your security. It then supplies your computer with the necessary software updates to keep it safe. The Secunia Personal Software Inspector (PSI) even automates the updating of many of these insecure programs, making it a lot easier for you to maintain a secure PC.
Using a scanner like the Secunia PSI is complementary to antivirus software, and as a free computer security program, it is essential for every home computer.