I do not see dumpbin.exe on my system. I have Visual Studio 2005 on my system. When I type dumpbin on the command line, it says unrecognizable command.
Dumpbin.exe of VS2005 generally presents in C:\Program Files\Microsoft Visual Studio 8\VC\bin. If you would have installed VS2005 in drive other the C, please search in that.
And then set that path in the system variable PATH.