Hi.....this problem started a few weeks ago on my pc where on updating before shut down, it showed, "we couldn't complete updates; undoing changes". I went on to microsoft support and been through the following stages;
1. Ran the network troubleshooter
2. Ran the Windows Update troubleshooter...
64-bit
corrupted files
hardware
installation
intel i7
microsoft
network issues
pc performance
ram
servicingstackupdate
software
support
system restore
troubleshooting
updateupdate issues
user experience
windows
windows 8
windows 8.1