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Hy,
I have the same Powercolor 550 card but without your problems.
It could be a bad reception on the TV cable. Try to verify the quality of the TV signal on the cable with another TV set or TV receiver.
If the quality for the TV signal on the cable seems to be OK, than it could be a different TV standard (e.g. NTSC system instead of PAL system or viceversa). You didn't mention the TV system for your Powercolor 550 card.
The last case is with a defective TV tuner card.
If this is the case try to change the defective TV tuner card with another card during the warranty period or return the defective card with money back request.
For the image quality my best experience was with Windows Media Center from Windows MCE 2005 and Windows Vista. Very good quality I got also with ATI MMC 9.15 and 6.14.10.175 drivers. The latest drivers 6.14.10.194 created problems for me when using ATI MMC 9.15. With 6.14.10.194 drivers, the ATI MMC 9.15 TV application was unstable for reception of PAL B TV signals (ATI MMC 9.15 freezes, no 576i PAL signal detection, etc. etc.). My region settings are for Germany (PAL B).
Best regards
sami
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