I have SP1 neither installed, nor uninstallable ...
Here's the story: Win Update told me that SP1 was available, and so I accepted the update; after the usual creation of a checkpoint, the update downloaded, and (after a long time) the update terminated. As requested, I rebooted - which started in the usual manner, but then hung up midway through the boot procedure.
After retrying a restart, with the same result, I rebooted in safe mode - no problem. I then went to 'Recovery', and selected the checkpoint just prior to the attempt to install SP1. This seemed to go OK.
I then removed some possibly problematic USB devices, installed all the pending non-SP1 updates satisfactorarily, and then tried again for the SP1 update (KB976932). The machine hung, with 0 bytes downloaded, and 0 remaining. I tried a few more times - same result.
I rebooted, and investigated the update status. "Installed updates" does NOT show SP1 installed - and so it cannot be 'uninstalled/(removed)'; on investigating, the Update History shows SP1 (KB976932) installed once 'Successfully', and twice 'Cancelled'.
I ran the Hotfix download KB947821 -which allegedly checks readiness for SP1, and it installed successfully. But the end result was unchanged - no SP1 installed, and when again selected, it would not download.
I guess that the download function checks the list of 'Succesfully installed' updates, and if it sees SP1, the it spins into an endless loop ('0 downloaded, 0 remaining').
So the net result is - not installed, but won't try again !!!
I guess that it is neccessary to remove it from Update History - but how do I do this, when it doesn't show up in Installed Updates ???
I have not seeen this problem in the forum, so I am at a complete loss. Does anyone have any ideas? I am going nuts over this ...
Any help would be much appreciated.