Fix Error Code 0xc004f050 When Activating Windows 10

This thread contains info on how to fix Error Code 0xc004f050 while trying to activate or register your Windows 10

Workaround: try again in 24 hours.
Method 1: Re-insert the product key
Method 2: Activate Windows by using the automated telephone system
Right Click Computer
Choose Properties
choose Activate Windows Now

(from: superuser.com)
Or, run slui.exe 4 and follow...
And, visit www.microsoft.com/licensing/existing-customers/activation-centers.aspx and contact the right number.
Method 3: Troubleshoot Volume Activation issues
For details, plz read support.microsoft.com/en-us/kb/938450
Method 4: uninstall current OS, reinstall a clean Windows 10 and/or other OSes later.
Download Media Creation Tool (MCT): windows.microsoft.com/en-us/windows-10/media-creation-tool-install
or download Windows 10 ISO from microsoft www.microsoft.com/en-us/software-download/windows10ISO/ (recommended). E.G.:

software-download.microsoft.com/pr/Win10_1607_English_x32.iso?t=b7158174-3f62-4ddf-b145-366f3ac00d3f&e=1475359307&h=92b006059a1eb723f79c11bece30f7f4
software-download.microsoft.com/pr/Win10_1607_English_x64.iso?t=b7158174-3f62-4ddf-b145-366f3ac00d3f&e=1475359308&h=ab4b7508b874c76d5e56c3de4882e82c
For additional info, please read answers.microsoft.com/en-us/insider/wiki/insider_wintp-insider_install/how-to-troubleshoot-product-activation-in-windows/33f31475-93b3-4d1c-812f-4b21fbd807a7
For Windows Server 2008 R2, try running cmd one by one:
Net Stop slsvc
Net Start slsvc
slmgr -ipk <KMS Host key>