Jumping Screen in My TV

[vbtrek]

TV-Server Version: 1.0.0.0 RC2
MediaPortal Version: 1.0.0.0 RC2
MediaPortal Skin: Any
Windows Version: 32bit Vista Home Premium
CPU Type: Intel(R) Pentium(R) 4 CPU 3.00GHz, 1 Core(s), 2 Logical Processor(s)
HDD: 150GB, 50GB Free
Memory: 1GB
Motherboard: ??
Video Card: NVIDIA GeForce 7300 GS
Video Card Driver: v7.15.11.7519 from NVIDIA
Sound Card: Realtek High Definition Audio
Sound Card AC3: ??
Sound Card Driver: v6.0.1.5485 from Realtek
1. TV Card: Hauppauge WinTV Nova-T 500
1. TV Card Type: Dual digital DVB-T PCI TV Tuner card
1. TV Card Driver: v4.3.25050.0 from Hauppage
MPEG2 Video Codec: MPV Decoder Filter
MPEG2 Audio Codec: MPA Decoder Filter
h.264 Video Codec: None
Satelite/CableTV Provider: Freeview
HTPC Case: Elonex Artisan
Cooling: ??
Power Supply: ??
Remote: Phillips Pronto - MCE Remote IR Signals
TV: Samsung 32" Flat Panel
TV - HTPC Connection: DVI Cable

When I view a TV picture, whether in full screen or the smaler scren with the menu to the left - the entire screen jumps up and down. This also occurs viewing any recorded videos, haven't tried any DVD's yet.

If I preview any TV channel from the TV Server Configuration -> TV Channels view the preview is faultless. Also Windows Media Centre works perfectly on this PC, but I was hoping to switch to Mediaportal because it looks like a much better piece of software.

Can anyone help?

[vbtrek]

Is nobody able to make any suggestions to help me with this?

What a shame looks like i'll have to stick with Vista Media Centre and it's hopeless TV guide.