This program might not have installed correctly – How to fix the error message?

“This program might not have installed correctly” many users might have faced these prompt upon installing or running programs on windows. Well many of us mistook it as an error, but this is a new feature named Program Compatibility Assistant (PAC) introduced in Windows vista and 7 and gets triggered when there is any problem with programs supporting compatibility on current windows. Here is the tutorial to disable or Turn Off Program Compatibility Assistant (PAC) notification.

disable program compatibility assistant

When you try to install a program that is not compatible with your Windows, the PAC shows you a warning window with a message “If this program didn’t install correctly, try reinstalling using settings that are compatible with the version of windows“. This notification notifies you that your system has encountered a problem and offers to fix it the next time you run or install the program. Program Compatibility Assistant warning depends on the seriousness of the compatibility issue and even block the program from running.

When you get the prompt from the program compatibility assistant, you get to see two choices. First is the Reinstall using recommended setting and the other is This program installed correctly. If you opt the second one, nothing will be changed either on program or computer. While selecting the first one, No changes are made to the program itself but the Program Compatibility Assistant will try to resolve conflicts with User Account Control Or, it can run the program in a mode that simulates the earlier versions of Windows. The changes that Program Compatibility Assistant makes are done automatically.

Disable or Turn Off Program Compatibility Assistant (PAC) Notification

If you are the one installing different kinds of software’s then this feature can be really annoying one. Here is how you can disable from Microsoft service management console the PAC feature and prevent any kind of message related to PAC.

  • Click Windows start orb and type services.msc in the search box.
  • Now click to run the Services.msc
  • In the list of services that appear, search Program Compatibility Assistant Service

pcasvc services

  • Double click on it and tap the general tab’s Startup type section. Select Disabled and click apply.

disable pcasvc

Upon following the steps described above, you will no more get the irritating PAC prompts “This program might not have installed correctly”. Because the service “Program compatibility assistant” won’t be triggered further.


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