Can´t record and watch tv at the same time (1 Viewer)

[frank75]

MediaPortal Version: 1.0.2.0
MediaPortal Skin: Theatre
Windows Version: Win XP SP3
CPU Type: Athlon64 X2 4400+ 2.3GHz
HDD: WD 320GB IDE
Memory: 2x512 Corsair DDR2 PC5300
Motherboard: Asus M2N-E SLI
Video Card: Asus EN8600GT/SI/HTDP/256M
Video Card Driver:
Sound Card:
Sound Card AC3: Coaxial out
Sound Card Driver:
1. TV Card: Hauppauge WinTV-PVR500MCE
1. TV Card Type:
1. TV Card Driver:
2. TV Card:
2. TV Card Type:
2. TV Card Driver:
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: AC3 Filter
h.264 Video Codec: Cyberlink H.264/AVC PDVD8
Satelite/CableTV Provider:
HTPC Case: Antec Overture
Cooling: Zalman CNPS8000 Slim CPU-Cooler
Power Supply:
Remote: Harmony 525
TV: Samsung LE-40M86
TV - HTPC Connection: DVI - HDMI

Hi.

When i start to record a tv-program, i am not able to watch on another channel.
I use Hauppauge WinTV-PVR500MCE and this have 2 tuners.
I installed MP today to get a fresh start.
I know this works, because i have done it before.

Anyone know why i can´t record and watch tv at the same time?
It also takes some time when i switch between channels in the tv guide.

Thx