Took a while to dig out as the TV pack changed the scedules due to the new capability of controling this in the UI.
Here we go:
1) Right Click MYComputer / Manage
2) Look for Task Scheduler
3) Expand Task Schedule/Task Scheduler Library/Microsoft/Windows/Media Centre
4) Right click "MCUPDATE" then select "Export" save the XML file to your desktop
5) Right click "MCUPDATE" then select "Disable"
6) Make sure that the top heading "Task Schedule library" is selected. (Highlighted)
7) Right click "Task Schedule library" and select "Import Task"
8) Select the .xml file you exported in step 4 and click open
9) Change the task name to something like "My MCUPDATE"
10) Click on the triggers tab and edit the "Daily" trigger to a time to suit.
11) Close this.
You sould now have a new task called "My MCUPDATE" in Scheduled tasks in the main "Task Schedule library" and a disable "MCUPDATE" task in /Task Scheduler Library/Microsoft/Windows/Media Centre. You have to do this or else the hack will not work and the registry will reset to default after one sceduled guide update!
Then change the download time using
http://www.avsoft.nl/Tools/guidedltime/
Background Info:
mcupdate is only in Vista. It downloads packages on a scheduled basis. It downloads the following packages:
* Directory Service: The Directory Service package lists the packages that are available in a region. The Directory Service package also provides information about how to obtain packages, about how frequently to download packages, and about when to download packages.
* Client Update: The Client Update package contains updated regional information. This data (e.g. format of postal code in that region), is used in the TV Setup wizard (that we call first run or fun), and in some other areas of the product.
* Sports: US & Canada Only. The Sports package contains information about sporting events. This information is integrated with other Electronic Program Guide (EPG) information.
* Net TV: US only. The Net TV package contains information about videos that are available on demand for MCE's Internet TV option.
* MCESpotlight: Contains the information used to populate the online spotlight section of MCE.
Its fine to disable the mcupdate scheduled task. Outside of the US you dont really loose anything (except online spotlight updates)