Execute this line in the CMD as Administrator (start > type ‘cmd’ > hit control+shift+enter) and paste this line (rightmousebutton > paste).
reg add HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ /v LocalAccountTokenFilterPolicy /t REG_DWORD /d 1
Be sure to DISABLE your Homegroup and to enable file sharing in the Network & Sharing Center

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