KB2919442 is necessary prerequisite for installing the Windows 8.1 Update 1.
Kindly, follow these methods and check if it helps.
Method 1:
As you are unable to remove KB2919442, please try the command line to uninstall the update.
Follow these steps.
a. From Start screen, type cmd, right-click on Command Promptand choose Run as Administrator. b. b. Type: wusa /uninstall /kb:2919442 and press Enter.
Now, try to install the updates.
Method 2:
If that does not help, please ensure that you check the Security software/firewall installed on the computer as that might be causing the issue.
Temporarily disable security software and firewall temporarily and try access the apps.
Windows Firewall from start to finishhttp://windows.microsoft.com/en-us/windows-8/windows-firewall-from-start-to-finish
Important Note: Antivirus software can help protect your computer against viruses and other security threats. In most cases, you shouldn't disable your antivirus software. If you have to temporarily disable it to install other software, you should re-enable it as soon as you're done. If you're connected to the Internet or a network while your antivirus software is disabled, your computer is vulnerable to attacks
**Method 3:**You can also obtain the stand-alone update package through the Microsoft Download Center. For more information, go to the Microsoft Download Center and then search for KB2919355.