Client OS: Windows 7 Server OS: Windows Server 2008 R2 net localgroup administrators DomainName\Help.Desk /add System error 5 has occurred. Access is denied. Above mentioned command is working on Windows XP, but not on Windows 7.

When you launch the command prompt launch it using the Run As Administrator option and then execute the command.

Try launching the command prompt launch it using the Run As Administrator option and then execute the command.

Thanks for assistance. I will deploy this in form of bat file via Group Policy in Computer Configuration. If I will face any problem then post my query. I have both Windows XP & Windows 7 OS on client computer.