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I don't know the correct naming in English Windows, but in Windows 7 try this, and follow the red numbers.
Walter
Walter Holzwarth
Hmm, I don't have any True Color? Maybe Millioner av farger is True Color in english.
I think so. What happens after trying? Message should have disappeared. Perhaps a re-boot is needed.
Walter Holzwarth
You should also check, your monitor should be 60 Hz as well.