The guide data changes for ATSC/QAM only and for Windows 7 only.

The data changes will happen on March 11 09 this will require you to re-run TV setup, after the TV setup no further steps are needed.

When the guide data goes live on March 11 09 I would wait until the next day (Mar 12 09) to rerun TV setup, just to insure the data download has completed.  

More info here

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