I have a small netbook style laptop, it can't/won't install any updates after January this year. No error code, no accessible log to say what the bloody problem is. Just the message "can't install update because previous update hasn't finished".
I don't use the machine often enough to be bothered to put the effort in to fix this. I'll see if there is a linux distro about for it soon.
Windows update is by far the worst element/product/turd that Microsoft has ever produced in a long history of producing large steaming turds.
'Steaming Turd' Icon needed.