I understand that you are unable to use Network Sharing Service in Windows Media Player, to resolve this issue, make sure that all dependant services have been started. To do this, follow these steps:
This issue may be caused due to any third party application causing the conflict. Let us perform some troubleshooting steps and check if that resolves the issue.
Method 1: Perform clean boot and check.
You may perform a clean boot to check if any third party application is causing the issue. To help troubleshoot error messages and other issues, you can start Windows 8 by using a minimal set of drivers and startup programs. This kind of startup is known as a “clean boot.” A clean boot helps eliminate software conflicts.
Follow the given link to perform Clean boot: http://support.microsoft.com/kb/929135
Important: Reset the computer to start as usual.
Note: After you have finished troubleshooting, follow these steps to boot to normal startup.
a) Press the ‘Windows + R’ key on the keyboard.
b) In the ‘Run’ windows type ’MSCONFIG’ and click ‘Ok’.
c) On the ‘General’ tab, click the ‘Normal Startup’ option, and then click ‘OK’.
d) When you are prompted to restart the computer, click ‘Restart’.
Method 2: SFC Scan
Run a system file checker scan and check if that helps. Refer the following steps to run SFC scan.
a) Move the mouse pointer to bottom left of the screen where you see preview of start menu and Right-click to bring up a list of Windows settings.
b) Click on ‘Command Prompt (Admin) to bring up elevated command prompt. Note Click ‘Yes’ if it prompts for permission.
c) In the command prompt type in the following command ‘sfc scannow’.
The sfc /scannow command scans all protected system files and replaces incorrect versions with correct Microsoft versions.
Method 3: Turn on Dependency Services.
Reply with the results, I would be glad to assist you further. If you have any other query related to windows, feel free to post.