System Center Endpoint Proection Definition Updates Fail in Windows 8.1
If a Windows 8.1 device fails to update antivirus definitions for SCEP the following procedure will resolve the issue:
1. Open Control Panel
2. Click on Windows Update
3. Click on Change Settings
4. Check the box labeled "Give me updates for other Microsoft products when I update Windows"
5. Click OK and close the control panel windows.
6. Run definition updates in SCEP, they should now successfully install.