You may use directx tool dxdiag for this (bonus - it is already installed with directx on your computer).
Go to Start/Run
type dxdiag
You may save system specs to a text file. Delete unneeded info from it, and you are ready to send it to your project manager.
You may also use Microsoft msinfo32 tool in the same manner. (However dxdiag provides more useful info for game debugging).
TIP: You may check many features of your system. For instance, it is useful to learn which directx driver is your system actually using (in case of The file d3d9d.dll is a debug version, which will run slower than the retail version. message). Go to your directx utilities folder, find directx control panel, check Use Retail version of Direct3D for more speed - if it's not checkboxed already).