System administrators often need to maintain a documentation of computers in a network.
Here is a script called Pcserial.vbs that will help you retrieve the serial number from PC’s remotely.

The remote host must support WMI 1.5.
Windows XP, Windows 2000, Windows NT 4.0 with SP4+, Windows 98 will support this feature.

Note: To avoid accidental running of the script, the scripts on this web server are stored as *.vb_ file. Clicking on the link will bring up the script in the browser. From there you can save it for later use, simply by selecting All text in the browser window and copy/pasting it into your own newly created .vbs script file.