Build error: Exception from HRESULT:0x8007007E

Hi All, I have installed Visual studio 2005 on my machine. If we build the project on my machine, it throws the build error in web.config file. Where as same project builds and runs well in other machines with same configuration. When we build the project, before building it throws the following error The specified module could not be found. (Exception from HRESULT: 0x8007007E) ~\1.0\Web.config 13. Here 13 is the line number in the web.config file. for the following block it throws the exception: <compilation defaultLanguage="c#" debug="true"> <compilers> <compiler language="c#" type="Microsoft.CSharp.CSharpC­odeProvider, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E08­9" extension=".cs" compilerOptions="/d:DEBUG;TRAC­E"/> </compilers> <assemblies> <add assembly="Configuration, Version=2.0.0.0, Culture=neutral, PublicKeyToken=F9287EB53A53509­C"/> </assemblies> </compilation> If I remove this block from this web.config, it throws the same error in the machines, web.config file at the same section where it refers mscorlib.dll file . Can anybody help out in resolving this issue? What may be the cause of this kind of error? Regards, Sunil