One of the most common error that user faced in using oradim utility is :
DIM-00014: Cannot open the Windows NT Service Control Manager.
O/S-Error: (OS 5) Access is denied.
This error is common in Windows Vista and windows 7 .
Its means that the user from which you are using oradim has not sufficient privileges .But most of the users complaint that they are performing this task from Administrator user or they have only one account in windows and its administrator ,but still they are facing this problem .
So the solution is very simple ,
just goto start wirte cmd ,cmd icon appears ,right click on it ....
Then click on "Run as administrator" and then create your required service .
oradim -new -sid myservice ;