Hi Arif,
- Which antivirus program is installed on the computer?
- What is the exact and complete error message you get when you install KB2919355?
- What is the make and model of the computer?
This issue might occur due to corrupt Windows Update components.
I would suggest you to place the computer in a clean boot state and check if you are able to install the updates. Follow the methods mentioned below:
Method 1: Run the Windows Update troubleshooter:
http://windows.microsoft.com/en-in/windows/troubleshoot-problems-installing-updates#1TC=windows-8
Restart the computer once after running the troubleshooter. Check if it fixes the issue. If not, proceed to the next method.
Method 2: I would suggest you to download and install the update manually and see if that helps from the following links:
Install the latest Windows 8.1 Update
http://support.microsoft.com/kb/2919355/en-us
Method 3: Refer to the link to run DISM tool to fix inconsistencies on Windows:
Refer to the section “Use the inbox Deployment Image Servicing and Management (DISM) tool to fix corruption errors”
http://support.microsoft.com/kb/947821/en-us
Note: This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, you can refer to the following steps to back the registry files on the computer:
- Press Windows and Rkeys to open the run box.
- Type ‘regedit’ and press Enter from the keyboard.
- Open the file option on the menu bar.
- Click on Export and save the file with a name on the desktop.
- If you want to restore the file, you can do so by double clicking the file that you have saved on the desktop.
After running the commands, try installing the updates again and check if it fixes the issue.
Hope this helps. Let us know if you have any other issues with Windows in future.