few client having problem playing flash file in powerpoint presentation. The error message “some controls on this presentation can’t be activated. They might not be registered on this computer”

solution

The error message you are seeing is usually related to a flash OCX file not being properly registered on your computer. You could try the following to resolve your issue:
1) Quit PowerPoint.
2) Run the following command (using Start -> Run):
regsvr32.exe “C:\WINDOWS\system32\Macromed\Flash\Flash.ocx”

Note that the exact path may vary and the command should be applied to any of the following files that exist in the noted directory:

flash.ocx
flash8.ocx
flash9.ocx