PowerShell in Windows 7 - HowTo Add-Computer to specific OU?

In Windows 7, we need to use the PowerShell command to add a computer to a domain specific OU.

We used to use a netdom join command for Windows Vista and Server 2008. NetDom is not included with Win7 or Win2K8 R2 from what I can see.

So, we need to use PowerShell. The Add-Computer command should accomplish what we need, but I sure cannot get to the proper syntax using the Help or online.

The targeted OU: OU=Win7OU,OU=MyBusiness,OU=Computers,DC=MySBSDomain,DC=Local
Domain: MySBSDomain.local
Win7 non-domain joined name: MY-Win7Beta

I have tried many different iterations of the command with no success.

Here is one (with and without the "" on the OU fails):

PS C:\Users\Information Services> Add-Computer -Credential MySBSDomain\Administrator -OUPath "OU=Win7OU,OU=Computers,OU=MyBusiness,DC=MySBSDomain,DC=Local" -Passthru -Server MySBSDomain\MySBSServer -ComputerName MY-Win7Beta -DomainName MySBSDomain.local
Add-Computer : This command cannot be executed on target computer('MY-Win7Beta') due to following error: Access is denied.
At line:1 char:13
+ Add-Computer <<<<  -Credential MySBSDomain\administrator -OUPath "OU=Win7OU,OU=Computers,OU=MyBusiness,DC=MySBSDomain,DC=Local" -passthru -Server MySBSDomain\MySBSServer -ComputerName MY-Win7Beta -DomainName MySBSDomain.local
    + CategoryInfo          : InvalidOperation: (My-Win7Beta:String) [Add-Computer], InvalidOperationException
    + FullyQualifiedErrorId : InvalidOperationException,Microsoft.PowerShell.Commands.AddComputerCommand

I am looking for the properly formatted syntax to run in PowerShell itself. This is priority number 1.

From there, a script would be good to go too.

Thanks.

Philip