Error with Windows Update KB3000850

Thanks mate but I had also tried that before. No luck at all.

I know the  feeling.  Try what I  did -- see my 12/18/14 post       

I know the  feeling.  Try what I  did -- see my 12/18/14 post

This is driving me insane! 2 days trying to install this update and so far no luck. Problem is I Always get 8024200D error.

I know this update is 700MB+. It first downloads and installs the whole thing but after restarting my PC this update is showing again but it is only 63MB. This is what is failiong to install.

I have tried every single tip in the MS fórum, like sfc scan, dism.exe, restarting Windows update using .cab from MS.

Nothing seems to work.

Anyone with same issue?

Any help is appreciated.

UPDATE to my previous post regarding Update KB3000850

After hours of searching the forums and getting nowhere, I noticed that the time was about 3 hours slow on my pc.  I checked and time zone was ok so I changed the clock to the correct time, and immediately got a windows message that said I needed to sign in and verify my identity.  I tried but only picture came up and no place to put in my password.  After a half hour of searching for a place to sign in, I finally did a restart which appeared to kill it as it wouldn't come back up so I finally had to turn off my power strip.  When I turned power strip back on, my computer came back up to the start screen, I signed on and everything I've checked so far seems ok now.  No more "floating" in Excel and seems almost back up to speed!  Now I have to wonder if the clock time is an indication of more trouble to come or just a one time incident, and could that be what was causing all the trouble?

Ok so I am seeing lots of suggestions and technical help for installing the KB3000850 update.  Here's my issue:  Yesterday on 3/14/15 I got message that my windows 8.1 computer was going to shutdown to install updates so I let it.  I didn't sit there and watch to see if it went to 100 percent but when I came back later, it was at the lock screen so I signed on.  My less than a year old XPS 8700 is running in slow motion!  Not just the internet but everything looks like a 3 second slide show.  It's like when I select something it floats out until finally coming to rest.  When I select a cell in my Excel spreadsheet, it floats in slow motion before finally coming to rest in selected cell.

This is what I've checked:  In control panel it shows that the last updates successfully installed were on 3/11/15 and nothing for 3/14/15.  It also shows KB3000850 as being successfully installed on 3/9/15.  So I clicked on "View installed updates" and I see about 25 updates for 3/14/15 installed and one being an update for KB3000850.  So I don't know whether it was installed or not, and why if this came out in November 2014 did it takeover 3 months for me to get it when I've always had my automatic update install turned on, and what has happened to put my computer in slow motion?  I only know how to use my computer, and know nothing about messing with the registry and even if I did I probably couldn't find it in windows 8!   Also what is a CBS log and how do I find it?  I would appreciate if anyone has any suggestions or knows what could be going on?