Things to remove/disable in Windows 10 Anniversary Update
Edit: Toned down a bit address strictly privacy issues. Why Windows 10 is a privacy nightmare. I've searched to index only quality sources including cross-references.
https://www.microsoft.com/en-us/accessibility/windows10upgrade
Windows 10 Media Creation Tool
Windows 7/8 keys can activate Windows 10.
Disk Cleanup>C:>OK>Clean up system files>Previous Windows installation(s)
Get-AppxPackage -AllUsers | Remove-AppxPackage
Edit group policy>Administrative Templates>Windows Components>Windows Update>Configure Automatic Updates>Disabled
http://www.ghacks.net/2015/08/14/comparison-of-windows-10-privacy-tools/
Ctrl+Shift+Esc>Startup
Windows Key+X>Computer Management>Task Scheduler
Edit group policy>Administrative Templates>Windows Components>Search>Allow Cortana>Disabled
Edit group policy>Administrative Templates>Windows Components>OneDrive>Edit Prevent the usage of OneDrive for file storage>Enabled
Services>HomeGroup Listener/Provider>Properties>Startup type>Disabled
Control Panel>Security and Maintenance>Change User Account Control settings/Change Windows SmartScreen settings>Never notify/Don't do anything
Registry Editor>HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\NetworkList\DefaultMediaCost>Ethernet>2
Must be disabled to update Windows.
netplwiz>Users must enter a user name...>Uncheck
EFF's Surveillance Self-Defense
AV test results from April 2016
Real-World Protection test results from June 2016
https://www.reddit.com/r/privacytoolsIO/wiki/index
BestVPN's Ultimate Privacy Guide
This thread on PCMR is a good one if you want to disable some of the more annoying features in W10