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

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Article ID: 889508
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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 "Drive_letter:\Path\Microsoft Virtual PC 2004.msi" /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 "Drive_letter:\Path\Microsoft Virtual PC 2004.msi" /qn PIDKEY=XXXXXXXXXXXXXXXXXXXXXXXXX, where the string of "X" characters is your 25-character Product Identification number for Virtual PC 2004 SP1.

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Article ID: 889508 - Last Review: September 10, 2011 - Revision: 2.0
Keywords: 
kbsetup kbtshoot kbprb KB889508

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