I've put off updating windows for a long time, yesterday I decided I might as well update as it's been almost a year. After installing the updates I ran into a plethora of problems: my mouse sensitivity had been changed, some desktop icons added, various programs were installed that slowed start up. My Disk resources were constantly being pushed to around 100% at all times. I did my best to figure out what had been causing the problem, but couldn't pinpoint it. I decided my best option was to delete all of the updates, and for the most part that worked. My mouse speed went back to normal, there were no more fishy background programs running, and I could actually launch applications without them moving extremely slow. This all lasted for about ten minutes, but then my computer began to slow again and the same issues emerged. I went to check my update history again and there were two updates that I had installed yesterday that it would not allow me to delete. I googled them both and found that one, KB3012199, had caused several people across multiple forums (including one here on microsoft that went unresolved) have had the same problem. I'm asking if anybody knows of any way to delete this update, or of a fix that has been released for it. This issue is a huge let down, never did I think that updating my PC would break it to this extent. Any help is appreciated.

Unfortunately after you install this servicing stack update, you cannot uninstall it to revert to an earlier version of servicing stack update.

Try to create new user account as an administrator (it may not help).

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Use the System File Checker tool to repair missing or corrupted system files

http://support.microsoft.com/kb/929833/en-us

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In order to perform System restore :

How to refresh, reset, or restore your PC

Hi,

As S.Sengupta mentioned, the servicing stack update can not be simply uninstalled since it is required by the system (there's no uninstall option), I have installed the update in my Windows 8.1 system and everything is still functioning fine. We recommend to get latest windows updates.

And Windows updates should not bring additional desktop icons and programs to your system, it is used for system maintance. I suggest you run virus scan in case the system might be infected with malware or virus.

Use system restore to return the system to a previous state with a restore point (I returned to a previous state, it removed the update, maybe you can have a try, but I doubt that the issue you encountered is not related to the update).

Add:

It's recommended to set to install important windows updates automatically, you can also use disk cleanup to release the disk space.

Regards

There are a number of things that could be degrading your system performance. You should open Resource Monitor and post a screenshot showing the processes using the most processor, disk, and memory. It is possible that after installing all of the updates missing for the past year that tiworker.exe is running in the background. This process cleans up your installation following update installation.

Additionally, drivers may have been installed with Windows Update that could be a part of the issue. I would suggest manually checking for the latest available drivers for your system or its devices from the manufacturer.

Brandon
Windows Outreach Team- IT Pro
Windows for IT Pros on TechNet

There are a number of things that could be degrading your system performance. You should open Resource Monitor and post a screenshot showing the processes using the most processor, disk, and memory. It is possible that after installing all of the updates missing for the past year that tiworker.exe is running in the background. This process cleans up your installation following update installation.

Additionally, drivers may have been installed with Windows Update that could be a part of the issue. I would suggest manually checking for the latest available drivers for your system or its devices from the manufacturer.

Brandon
Windows Outreach Team- IT Pro
Windows for IT Pros on TechNet

• Proposed as answer by Roger LuMicrosoft contingent staff, Moderator Wednesday, March 25, 2015 9:33 AM

I am finding it very slow to select something from the taskbar at the bottom of the screen.

It is particularly bad when there are multiple windows (eg. multiple browser windows, or multiple folders open in Windows Explorer), and choosing among them.

I do not remember that update last month, but a colleague tells me that is probably what did it.