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#30
I had the same problem the start-up repair tool would finish saying ii had failed to repair - I would then shutdown. Switching on I would find the system had been restored prior to the update. I then turned off automatic updates.
I found a solution that worked for me while I was investigating why google chrome would not load web pages and why opera would not install. This solved the opera and chrome problem and after turning updates back on the start-up repair loop.
It turns out that it was a malware problem that got past comodo. Download, install and run the tdds remover:
How to remove malware belonging to the family Rootkit.Win32.TDSS (aka Tidserv, TDSServ, Alureon)?
I hope it works for you.