Microsoft KB Archive/889508

= You receive a &quot;Missing or Invalid Product Key.&quot; error message after you upgrade to Virtual PC 2004 Service Pack 1 =

Article ID: 889508

Article Last Modified on 12/21/2004

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APPLIES TO


 * Microsoft Virtual PC 2004 Service Pack 1

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SYMPTOMS
After you install and start Microsoft Virtual PC 2004 Service Pack 1 (SP1), you receive the following error message:

Missing or Invalid Product Key.



CAUSE
This problem occurs if you perform a quiet (unattended) installation of Virtual PC 2004 SP1 by using the following command line: msiexec.exe /i &quot; :\ \Microsoft Virtual PC 2004.msi&quot; /qn.

A typical installation of Virtual PC 2004 SP1 uses the Setup Wizard. A typical installation saves the product key for Virtual PC 2004 for use with Virtual PC 2004 SP1. When you perform a quiet installation, the product key is not saved correctly. Therefore, the error occurs.



WORKAROUND
To work around this problem, you can perform a quiet installation of Virtual PC 2004 SP1 by using the PIDKEY Setup switch, as in the following example:

msiexec.exe /i &quot; :\ \Microsoft Virtual PC 2004.msi&quot; /qn PIDKEY=, where the string of &quot;X&quot; characters is your 25-character Product Identification number for Virtual PC 2004 SP1.

Additional query words: VPC VMC VPC2004 VMC2004 VPC2k4

Keywords: kbtshoot kbsetup kbprb KB889508

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