Problem with flash setup installation

My friend is having a problem installing flash player 10. I copied the installer from one of the computers at work and when she tried installing it, nothing changed in her browsers and other flash applications. We restarted the computer to see if it will take effect after, but again nothing changed. So we tried uninstalling and reinstalling the software and we get this error when opening the installer.

Adobe Flash Player 10 ActiveX
Error 2753. The File 'FP_AX_MSI_INSTALLER.exe' is not marked for installation.
Any idea how we can fix this?
