In Windows Vista Media Center, a manually scheduled TV program may start one hour late when Daylight Saving Time (DST) ends
Consider the following scenario: In Windows Vista Media Center, you set up a manual TV recording to occur near or right after daylight saving time ends. After the recording has finished, when you go to view the recording, you find that Media Center did not record the correct television program as expected. Instead, it appears that Media Center recorded a television program that was one hour later than expected.
Note: For most of the United States, daylight saving time (DST) starts at 2:00 A.M on the second Sunday of March. Daylight saving time reverts to standard time (ST) at 2:00 A.M on the first Sunday of November.
For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB961374.