I've just come out of a grim period due to blasted KB3022345 and thanks to help from dc3 - see http://www.bleepingcomputer.com/forums/t/578361/major-shut-down-problems/page-2
There had been an earlier warning that Microsoft could be hiding yet another revision of it (5th or 6th?) under KB3068708 and I was advised not to install it, but wait a few days and then check here for any bad news (sound advice, especially if you've been nobbled by KB3022345).
Many months ago I changed my settings so that updates would not be automatically - well I thought that I had. But I hadn't - I should have chosen "check for updates but let me choose whether to download and install them".
Instead I'd selected "download updates but let me choose whether to install them" and the result when I shut down last night was the message "downloading1 of 9 updates - do not switch off" - I couldn't do anything to stop the updates being installed and I'm horrified that the option I'd chosen gave me no choice at all - there was no shield icon "updates are available" - they just installed presumably as part of the powering down process.
I've now got the "check for but let me choose" option in place but having seen that KB3068708 had been installed I ran sfc /scannow and the CBS log is again a huge one, 248 MB. Does the sheer size of it suggest problems (I haven't noticed any yet)?
I've put a link on the other thread so that dc3 knows what's happened.