Thanks for your quick reply
niemiro!
It sure worked, strange because I already did try to run the updates a couple of times after I had run the WU tool. Well it seems to be working again, so SP1 is now installed.. I only have a few hundred more updates to run, hopefully they will work. Otherwise I'll try the WU tool again and then perhaps come back here if it doesn't work
Many thanks for your time
niemiro! :)