compile the proxy code error in .net 2003 command prompt

in command promet use csc compile the proxy code :

C:\Inetpub\wwwroot\Test>csc /out:TestProxy.dll /t:library /
r:system.web.dll, system.dll, system.xml.dll, system.web.services.dll,
system.da
ta.dll TestProxy.cs
Microsoft (R) Visual C# .NET Compiler version 7.10.6001.4
for Microsoft (R) .NET Framework version 1.1.4322
Copyright (C) Microsoft Corporation 2001-2002. All rights reserved.
error CS2001: Source file 'system.dll,' could not be found
error CS2001: Source file 'system.xml.dll,' could not be found
error CS2001: Source file 'system.web.services.dll,' could not be found
error CS2001: Source file 'system.data.dll' could not be found
may be need set the envionment variables ? how to resolve it ?
thanks