Changed Program alert
Changed Program alerts warn you that a program that has asked for access permission or server permission before has changed somehow. If you click Yes, the changed program is allowed access. If you click No, the program is denied access.
Why these alerts occur
Changed Program alerts can occur if you have updated a program since the last time it accessed the Internet. However, they can also occur if a hacker has somehow managed to tamper with the program.
Remember, some programs are configured to access the Internet regularly to look for available updates. Consult the documentation for your programs, or refer to the support Web sites of their vendors, to find out if they have automatic update functionality.
What you should do
To determine how to respond to a Changed Program alert, consider these questions:
If you can answer "yes" to both questions, it's probably safe to click Yes.
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If you're not sure, it's safest to answer No. You can always grant permission later by going to the Programs tab. See Setting permissions for specific programs .
How to see fewer of these alerts
Changed Program alerts are always displayed because they require a Yes or No response from you. If you are using a program whose checksum changes frequently, you can avoid seeing numerous alerts by having Zone Labs security software check the program's file name only. Adding a program to the programs list .