But I think it is strange that I only get a good picture in MS MCE on the same computer..
It is as i get the same quality picture whether mce\MyTV\TVE3 but then i am using EVR under filter settings with Vista anyway.
Have you got another pci slot free, can you move card to it and retry, sorry chances are you will have to retune.
Asking as it may be something system wise that is not effecting windows as such.
ps, what graphics card are you using.
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