An error similar to the following is displayed during the configuration process:
Failed to deploy BizTalk system assembly "C:\Program Files\Microsoft\BizTalk Server 2010\Microsoft.BizTalk.DefaultPipelines.dll. Unspecified exception: File or assembly name FileName .dll, or one of its dependencies, was not found."
This error can occur if the Network Service account does not have write permissions to the temp folder on the computer running BizTalk Server. During configuration, BizTalk Server configuration uses Windows Management Instrumentation (WMI) to deploy .NET assemblies to the BizTalk Management database. WMI impersonates the Network Service account while deploying these assemblies to the BizTalk Management database and so the Network Service account must have write access to the temp folder on the computer running BizTalk Server.
Grant the Network Service account write access to the temp folder on the computer running BizTalk Server and run the configuration program again. To determine the folder that is specified by the TEMP environment variable, open a command prompt on the computer, type the following command, and then press ENTER: