A user has installed a legacy application in Windows 7 and reports that only some of the functionality in it is operational. Another user is using the same application on a different Windows 7…

System Protection manages restore points and shadow copies and does not directly restrict application functionality.

UAC restricts what applications can do without elevated privileges. A legacy application may require administrative rights for certain features. If one user's UAC settings are more restrictive or the user lacks elevated permissions, only the parts of the app not requiring admin access will function, while other features are silently blocked.

Action Center consolidates security and maintenance alerts but does not enforce permission policies that would block application features.

Data Execution Prevention (DEP) blocks code from running in non-executable memory regions to prevent exploits, but it would typically crash the application entirely rather than leave only some functionality operational.