Question : Powershell  Access is denied connecting to a remote computer

For some reason I can connect to all my win XP machines except one using powershell. I keeping getting the l 'Access is denied' error, even though the credentials are correct. Also the firewall is turned off. Could there be anything else blocking powershell?
Code Snippet:
1:
$pc = gwmi -class win32_process -ComputerName TESTPC -Credential $cred
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Answer : Powershell  Access is denied connecting to a remote computer

It is most likely a COM related issue

http://support.microsoft.com/kb/875605
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