BizTalk 2004 - Failed to deploy Biztalk system assembly

I know... world is flat? I think it's round... I am back to BizTalk 2004 for one of my client.

Was installing and Configuring BizTalk Server 2004 on Windows 2003 Server.

Nearly everything was working good and at the last minute of configuration ... BTS gave this weird error.

 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\7ff8w2-0.cs' could not be found.
error CS2008: No inputs specified.


Solution:- 
Give "Network Services" read and write access on this" C:\Windows\Temp" directory.


Problem solved.