Hi Suziwhy,
- Are you getting this error while upgrading to Windows 8.1 or while installing Windows updates?
- What is the make and model of the computer?
If you are getting this error while installing Windows updates then it normally occurs because the Wups2.dll file that is included in the latest version of Windows Update is installed incorrectly or has become unregistered.
I would suggest you to re-register the Wups2.dll file and check if it fixes the issue.
Follow the steps to re-register the file using Command Prompt:
a. Press Windows key + X keys and select Command Prompt (admin).
b. Run the following commands and hit Enter after each one of them:
net stop wuauserv
regsvr32 %windir%\system32\wups2.dll
c. You will now receive a verification message that says that the dll file is registered. Click on OK.
d. Start the Automatic Updates service. To do this, type the following command at the command prompt(admin), and then press ENTER:
net start wuauserv
e. Type Exit.
Reference:
Troubleshoot problems with installing updates
http://windows.microsoft.com/en-ca/windows/troubleshoot-problems-installing-updates#1TC=windows-8
You may try to install Windows 8.1 again after performing the steps given above.
Also refer to the link for more information:
Update to Windows 8.1 from Windows 8
http://windows.microsoft.com/en-ca/windows-8/update-from-windows-8-tutorial
Hope this helps. If you have any further queries/issues related to Windows, write to us and we will be glad to assist you further.