c#.net 2008 build (compile) problem

Question

I am asking for help on compiling a C#.net 2008 application since I have not
been able to obtain  a successful build with no errors yet.

This application that we need to support has no documentation and the
programmer(s) who wrote the application are not with the company any longer.
This C#.net 2008 solution has lots of project files in it.
You can compile this application in the following modes:
a.debug, b. debug-test, c.debug-development, d. debug-production,
e. release, and there is a class manager configuration file.
I am getting errors like:
1. Error 33 The type or namespace name 'completionImport' could
not be found (are you missing a using directive or an assembly reference?) 
C:\Documents and Settings\username\My Documents\Visual Studio 2008\Projects\
TableAdapterManager.cs 
I can find the namespace in lots of different *.cs files. However I do not
know what to do get get the correct *.cs file. I am guessing this has to do
2.  Warning 2 Could not resolve this reference. Could not locate the assembly
"Q.proxy". Check to make sure the assembly exists on disk. If this reference
is required by your code, you may get compilation errors.
I know that the program would compile without the proxies but I can tell
from the code that I will to use proxies like this.
Thus can you tell me how to resolve this problem.
3. Can you also tell me know to figure out how to obtain a good  build
for this soltuion?

Us girls at work have not seen a program like this before since
our most recent experience is using Vb.net 2003.
Thank you very much!