Well, SP3 installed fine on the back up....
But on the primary, I keep getting 'Access Denied'. When it eventually hands control of the computer back to me, checking the 'Update History' tells me that an 0x80070005 error was the problem.
WTF is an 0x80070005? On another occasion, it identified a 0x8007F02B.
This was when trying to use the Microsoft Update, rather than the Automatic Updates.
Can anyone advise what the cause - and remedy - of this problem is likely to be?