Microsoft previously released three Hotfixes. One to resolve a deinterlacing issue and two to address guide corruption issues with Australian EPGs. They were covered in detail in
this thread.
The three patches (KB935685 -Discovery Service Update Fix, KB938927 - Guide Corruption Fix and KB932649 - de-interlace problems) are all included in SP1 but they require two registry keys set to be effective. If you are running SP1 you
MUST set these keys to have a stable guide.
If you have previously installed these hotfixes, the keys will have already been set and you won't need to set them again, but if you are installing Vista clean and use SP1, then these keys are essential.
If you are not running SP1, then download the hotfixes in the other thread and install them.
I have made a .reg file you can download. Simply unzip it and then double-click on the file. It will update the registry for you. Download the file from
here