help with media center

I am trying to setup media center to watch live tv. I had no problems watching live tv on Vista before I upgraded to windows 7. When I get to the step in TV Setup that says "Downloading TV Setup Data" I get a message that states:
Download Failure
The new TV setup data could not be downloaded. The existing data, if available, will be used as you continue through TV signal setup.
It has no problem detecting my tuner. When I proceed, my TV guide has no channels listed (just number 1, 2, 3, etc with no information). If I try to watch tv, the channels don't come in clear.

Thansk in advance for any help!

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