Davey,
I have fixed my Media Center problem now and just have the issue of the system restore outstanding.
I can't get System Restore to work - it is consistently corrupting the backup files after a few days, so I have to delete them to create new ones, or if I do have a clean backup it fails to restore it, failing right at the end after it has rebooted the PC and saying it can't complete the operation, or with the error message "incompatible version of the serializing package. (0x80070724)" . I also get this message if I try to do a backup through Vista Backup. I think the issue originally arose when I was trying to do a backup and it failed.
I have Norton Antivirus 2007 installed and have found the instructions on disabling that for a system restore but it doesn't fix the problem. I have also tried to restore from Safe Mode, but it just fails to recognise that any restore points exist.
Sooner or later this is going to catch me out and I will need to do a reinstall I suspect.
Do you have any suggestions on fixing this, or If I do need to do a reinstall from scratch what is the correct procedure?
David