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01/28/2004 25727 views
Help with MSI (Microsoft Installer) error 1638: Another version of this product is already installed. Installation of this version cannot continue. To configure or remove the existing version of this product, use Add/Remove Programs in Control Panel.
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I received the MSI 1638 (invalid drive P:\) during uninstallation of a product. The only way I've found to get rid of this, was to install the Windows Installer Clean Up utility (msicuu) and to reinstall the msi.
Answered 02/25/2008 by: rpfenninger
Second Degree Green Belt