When my hard drive failed last year and I had to re-install all my set up (manually I might add thanks to the useless set-up discs and help-desk staff at a well-known PC comany) I had the same problem. The solution was, I'm afraid to say, was long and arduous. Due to that fact that some updates require the PC to be restarted and also that some are patches and fixes for previous patches and fixes you'll need to go through them and d/l and install one at a time. That way you can restart each time it's necessary and every now and then try to run all of the remaining updates and to see if you've found the "rogue" update already.