The other day I clicked the install update button by accident when adjusting the update schedule and what I thought would be a 5-10 minute setback in my work turned out over 2 hours when the windows update was apparently a full reinstall of OS, furthermore the build number has not changed after this all happened. Now the HDD is a little sluggish perhaps due to re-indexing of files. All local settings appear normal, no changed observed in anything. Since I accidentally clicked 'update' I did not get to see the details of the update. I had build 10586, still have it. Anyone care to speculate?