Hi there…
I didn’t have this problem before, i watched the same movie a week ago and the colors were perfect. i uninstalled the software several times and even tried older versions yet the same problem occurs. hope to fix it cause i really love this software 
this picture will speak for itself:
Do you also get color problems with other players now?
Is the problem with this file only? Have you tried others that use the same filter?
I also am having the same problem as jorry. All “other” players (nero, windows media doing fine) I have an ACER Monitor ACR0073 and NVIDIA GeForce FX 5200 Card. Have used MPC for years, first problem ever. Thanks
You should check the source video, whatever it is, and determine which filter the video stream uses. Then you should try another player which uses the same filter, and see if you have similar issues on this video.
You’ll need to determine what changed last week. Did you update your video drivers? Did you install a Windows update? An MPCStar update? Are you getting errors from the driver?