windows can't update

hi, I’ve just reformatted reinstalled everything, many hours but all seems ok, used CSC to clean all assuming the backups would restore if necessary. Now windows won’t complete installing sp2 in vista premium, error 80070005 which seems to be a registry problem. windows can’t open the backup files, worse:the registry backup file has gone, though the other 2 are still there. Also all the system restore points have gone except the one that was made when windows tried to instal the sp2 update. do I have to reformat again?

The first hit in Google brought me a “mêre à boire” as the French would say ( Goddarn French, if there weren’t any they should be invented).