Oracle Database 12c Considerations
Starting with Oracle Database 12c, Oracle supports the use of an Oracle Home User who will own the install of the database. This user must not have Microsoft Windows Administrator (admin) rights. Note that in this context, the user is the local Microsoft Windows user, not a database user.
Do not install the Oracle Database 12c into an existing Oracle Base directory. For example, do not install into this directory if it already exists:
C:\Oracle
If you attempt to install to an
                existing Oracle directory, the OEE12Setup.exe installer will likely
                fail. Later releases of this installer may be able to programmatically resolve this
                issue.
This section discusses these topics:
- Prerequisites to Running the OEE12Setup.exe Program
- Specifying the Oracle Home User and Oracle Base Directory