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Do you have an Oracle 11gR2 database already installed on your windows machine?
Assuming so, are you logged in as the Windows user you used when you installed the 11gR2 Windows database?
The error message indicates that your windows user is not a member of the Windows ORA_DBA group. Typically, the user who installs the 11gR2 database will be an automatic member of the ORA_DBA group, so you would not see that message.
You might want to login to Windows as administrator and try again.