Support>Knowledge Base>Product Installer Issues
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Article ID19
Created On8/6/2008
Modified4/8/2009
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Product Installer Issues
The source installation package for the product [product name] is out of sync with the client package. Try the installation again using a valid copy of the installation package '[package name]'.

Unable to uninstall old version of [product name]. Please uninstall it yourself using Control Panel Add-Remove Programs before attempting to install this product.

If you receive these message when installing or uninstalling it implies the product install has been corrupt on your system. Microsoft provides a utility 'Windows Installer CleanUp Utility' to help uninstall corrupt product installs:
http://support.microsoft.com/kb/290301