While You are trying to install Oracle Database On Windows 2008 R2 or any other Microsoft Os with user not administrator you will get

DIM-00014: Cannot open the Windows NT Service Control Manager.
O/S-Error: (OS 5) Access is denied.
Solution :

Run DBCA as administrator .

Click on start button -> All programs -> Accessories -> right click the command prompt icon > choose run as administrator -> 
invoke dbca in the commandline or oradim can also be used.
Thank you 
Osama mustafa 

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