Keeping your PC software up to date is a crucial step in staying safe in the online world. Software companies release updates to fix known vulnerabilities that can be exploited by attackers to gain access to your computer. Unfortunately we have many programs and it is often hard to keep track of what needs to be updated.
Secunia PSI (Personal Software Inspector) is a free program that will scan your applications and Windows files to determine if any software needs to be updated. After running the initial scan PSI will give you a score based on how many applications need to be updated and provide you the option to update the applications manually or automatically.
Watch this video explaining the install and use of PSI:
Note: The list of applications it searches is fairly extensive though custom and open source applications may not be included in the list. You will have to update these manually.
When first installed the program is set to automatically start when the computer boots. This option is good if you do not wish to remember to check for software updates but it will slow down your computers boot time. If you wish to manually run the scan you can disable the Start on Boot option by selecting Settings and uncheck Start on boot.