When running the config wizard for BizTalk2004 (on windows 2003) the following error occurred:
Failed to deploy Biztalk system assembly "C:\Program Files\Microsoft BizTalk Server 2004\Microsoft.BizTalk.DefaultPipelines.dll". Unspecified exception: Unable to generate a temporary class (result=1).
error CS2001: Source file 'C:\WINDOWS\TEMP\dbqvusoe.0.cs' could not be found.
error CS2008: No inputs specified.
The solution is to give the 'NETWORK SERVICE' user read and write access to the c:\windows\temp directory.
Thanks to Asbjørn for this : http://www.biztalkug.com/Newsgroups/setup/88013.aspx
HTH
Tim