You receive error code -203 when you try to install the Windows Media Player Firefox Plugin on a computer that is running Windows Vista

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SYMPTOMS

When you try to install the Windows Media Player Firefox Plugin on a computer that is running Windows Vista and Mozilla Firefox version 2.0.0.3, the installation may be unsuccessful. When this problem occurs, the Setup Wizard generates the following error code:

Error code -203

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RESOLUTION

To resolve this problem, install the latest version of the Windows Media Player Firefox Plugin. To obtain the Windows Media Player Firefox Plugin, visit the following Microsoft Web site:

http://port25.technet.com/pages/windows-media-player-firefox-plugin-download.aspx (http://port25.technet.com/pages/windows-media-player-firefox-plugin-download.aspx)

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WORKAROUND

To work around this problem, restart Firefox. Then, restart the Windows Media Player Firefox Plugin installation program. When you do this, you may receive a message that states that Windows is changing the Firefox compatibility settings. You do not have to take any action when you receive this message.

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STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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MORE INFORMATION

The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

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