Try this tool made by George King, it installs all of the updates that you've downloaded, it can even integrate the updates into a install.wim file.
It would be nice to add the Windows6.1-KB976902(xxx).msu inside the update list (ULZ) ton integrate inside the image offline!
I've integrated this one at last and all works fine.
About the tool made by George King. It's deleted by Norton Internet Security.
Thanks a lot for the new update list.
KB976902 is to be removed in the next UL's because SP1 RTM has leaked, plus some users have had trouble installing SP1 when this update has been installed, so that's why it will be removed in the next update.
As for the George King's update tool, don't worry it's a false positive, there is nothing malicous contained inside the exe file.