After succesful download still receive error message

I have installed shockwave flash player version 12 on my windows 7 computer.

The download was succesful, however when I want to play a video that's on my pc, I receive an error message (in Dutch, see attachment).

The video plays on the pc of a collega and the video works.

I have deinstalled the program and tried again, but this doesn't have an effect.

I tried the regular suggestions on the site, and it showed the tree just fine.

Hope somebody can help me.