http://www.ghacks.net/2016/08/08/10-ways-to-free-up-hard-drive-space-on-windows/

This will also get rid of hiberfil.sys:

powercfg -h off

http://www.makeuseof.com/tag/save-disk-space-compact-os-windows-10/

http://www.intowindows.com/how-to-compress-windows-10-installation-files-folders/

Current status:

compact /compactos:query

Compress Windows 10 OS:

compact /compactos:always

Disable the Security Center to get rid of notifications like Turn on Windows Security Center service:

Steps to turn off security center manually:

1. Open service.msc
2. Stop Security Center service and set it to disabled
3. Go to C:\Windows\System32
4. Take ownership of files ActionCenter.dll and ActionCenterCPL.dll
5. Get full access for the files “ActionCenter.dll” and ActionCenterCPL.dll
6. Rename the files ActionCenter.dll and ActionCenterCPL.dll to ActionCenter.dll.bak and ActionCenterCPL.dll.bak

sc config wscsvc start= disabled
reg add "HKCU\Software\Policies\Microsoft\Windows\Explorer" /v "DisableNotificationCenter" /t REG_DWORD /d "1" /f
reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Notifications\Settings" /v "NOC_GLOBAL_SETTING_TOASTS_ENABLED" /t REG_DWORD /d "0" /f