Oracle 12c Installation in Windows 7 error INS-30131
I found the problem. For reasons I don't understand Oracle needs access to the file system through the administrative network share (i.e. \computer\c$) and I had disabled it.

Things to check to solve this issue:


Remove your computer from workgroups.
Set HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System DWORD value LocalAccountTokenFilterPolicy to 1
Set HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\LanmanServer\Parameters DWORD value AutoShareWks to 1