Shutdown delay over 2 minutes after upgrading to Windows 8

Yesterday I upgraded from Windows 8 to Windows 8.1 on my Dell XPS desktop (i7-3770, 8 GB RAM). Now, when I shutdown, sleep, or hibernate, it takes over 2 minutes for the unit to do what used to take very little time. I reinstalled the video driver (both latest and two most recent version) and each time things are back to normal the first time I do it, but after that, the 2 minute, 12 second, or so, delay reappears. I have a NVidea 620 graphics card. My Acer laptop using its built-in Intel graphics system does not have this problem and never did. I am running Classic Shell on both machines. My desktop was fine before upgrading to Windows 8.1. Can anyone help with this situation? Thank you.

Mine was the same when I upgraded from 8 to 8.1 but it did settle down after a few weeks, now takes about 15-20secs to shut down

I found the fix and the solution.

In Device Manager I disabled the 5 Bluetooth drivers (two under Bluetooth, 2 under Network adaptors, and one under System devices). The first time I shut down, it went as normal, without the 2 minute delay.

I also updated the Intel Management Engine Driver - it was not needed, but why not get current?

I downloaded 2 files - MEI_Win8.1_5.0M_9.5.15.1730_PV.zip and MEI_Win8.1_1.5M_9.5.15.1730_PV.zip. I don't know what the difference is between them, but they both seemed to produce the same results with respect to the driver (05 Sep 2013, v9.5.15.1730). It looks like the 1.5M file is just a bit newer. But the other file (5.0M) has more files within it.

This was MOST helpful - keyliner.blogspot.com: Windows 8.1 Fix for Slow Shutdown and Restart