Flickering During Media Center Playback

Okay, so I've put together a home theater pc for our home theater. I used the following components:
- Gigabyte GA-EP45-UD3R
- Intel Q9400 Core 2 Quad
- 8gb ( 4x2gb ) G.SKILL PI Black DDR2 800
- ATI Radeon HD 3870 ( http://www.newegg.com/Product/Prod [...] 6814102719 )
- Hauppage 1800 Tuner Card ( http://www.newegg.com/Product/Prod [...] 6815116015 )
- Windows Vista Home Premium 64 Bit OEM

Now, when using media center, I get this strange issue where when the controls fade, playback flickers between the last frame of content that was displayed and the content itself ( as it's playing ). Now, obviously, this is incredibly annoying and makes Media Center unusable.

It seems to occur during the following playback modes:
- DVD Playback
- TV Playback
- Local Video Playback

However, the flickering does NOT occur during use of the Netflix module. The issue also does not occur when using any other video playback software; i.e. windows media player, powerdvd ( for blu-ray ), vlc media player, etc.

When I try minimizing the window ( so that it's not full screen ), the playback freezes. The audio still comes through, but the picture stays on the last frame that was displayed full screen; When I try to resize the window, the newest frame displays, but it doesn't play.

I have the latest drivers for both the ATI card ( ATI Catalyst 9.6 Drivers ) and the Hauppage card. I have applied all updates to Windows Vista through the Windows Update service.

If anyone else has this same issue, or if anyone has managed to solve it, please post here.

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