Very High CPU Usage with Frontend

[asdf46]

TV-Server Version: 1.0 RC1 Refresh
MediaPortal Version: 1.0 RC1 Refresh
MediaPortal Skin: Default
Windows Version: XP Pro SP2
CPU Type: Athlon 64
HDD: 100 gig Western Digital
Memory: 1gb
Motherboard: MSI K7N2
Video Card: Radeon 9000 or Old NVidia with PureVideo
Video Card Driver: Newest
Sound Card: Nforce
Sound Card AC3:
Sound Card Driver: 6.70
1. TV Card: Hauppauge PVR-350
1. TV Card Type:
1. TV Card Driver: 118_23257
2. TV Card: Pinnacle HD Pro Stick
2. TV Card Type: ATSC
2. TV Card Driver: Most Recent
3. TV Card:
3. TV Card Type:
3. TV Card Driver:
4. TV Card:
4. TV Card Type:
4. TV Card Driver:
MPEG2 Video Codec:
MPEG2 Audio Codec:
h.264 Video Codec:
Satelite/CableTV Provider:
HTPC Case:
Cooling:
Power Supply:
Remote:
TV:
TV - HTPC Connection:


When I start the Media Portal Front end my CPU is running at 90 to 100 percent just showing the main screen. Using the TV playback is slow and the video is jerky. I tried this with both the Radeon 9000 and an Nvidia card with equivalent results. I believe that all the drivers are the latest version. What would be causing this slowness. Outside of media portal my CPU idles around 0%.

Thank you,

asdf46