Below are some of the files and folder path which I believed are safe to delete.
I'll be adding more soon if I find another.
c:\Windows\System32\LogFiles\*.*
c:\Windows\Temp\*.*
c:\Windows\Prefetch\*.*
c:\Temp\*.*
c:\Tmp\*.*
c:\Users\%UserProfile%\AppData\Local\Microsoft\Windows\Explorer\ThumbCacheToDelete\*.*
c:\Users\%UserProfile%\AppData\Local\Microsoft\Windows\WER\ReportQueue\*.*
c:\Users\%UserProfile%\AppData\Local\ElevatedDiagnostic\*.*
c:\Users\%UserProfile%\AppData\Local\Temp\*.*
c:\ProgramData\Microsoft\Search\Data\Applications\Windows\*.*
c:\ProgramData\Microsoft\Windows\WER\ReportArchive\*.*
c:\ProgramData\Microsoft\Windows\WER\ReportQueue\*.*
If you know other location, maybe you can post too for others to be aware.
