Run the following commands if you are running low on C: drive space. Generally, this is caused by windows updates and you need to clear WinSxS free space. Do this in your PowerShell prompt and you will free up a substantial amount of space.
Please Note: You have to run updates on Windows Server 2008 if you are far behind and these commands don’t exist!
MASTER CLEANUP: (Run this First)
Dism.exe /online /Cleanup-Image /SPSuperseded
Windows 2008 Use: Dism.exe /online /Cleanup-Image /StartComponentCleanup
Windows 2012 Use: Dism.exe /online /Cleanup-Image /StartComponentCleanup /ResetBase
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