Windows Product Key Viewer

Windows Product Key Viewer is a lightweight and portable piece of software whose purpose is to reveal the Windows product key. You can use this tool when you have lost or forgotten the OS serial number, if you're planning on reinstalling Windows.
As installation is not an issue, you can just drop the executable file anywhere on the hard disk and run it directly. It is also possible to move Windows Product Key Viewer to a USB flash disk or other similar storage unit, from where you can run it on any workstation with minimum effort.
What's important to keep in mind is that the program does not work with the Windows Registry, or leave files behind on the hard disk after program removal.
The interface of the tool is based on a standard window with an uncomplicated layout, where all system details are immediately loaded at initialization, including the Windows serial number. Aside from this key, the app reveals the Windows version, product ID, install date and time, registered user and organization, Windows uptime, built number and machine GUID.
These details can be saved to a plain text document (TXT format) for further scrutiny. Plus, you can print it or copy it to the Clipboard. There are no other notable options available through this app.
Windows Product Key Viewer is very light on the system resources, using a minimal amount of CPU and memory. It has a good response time and displays information rapidly, without causing the OS to hang, crash or display error notifications. All in all, Windows Product Key Viewer comes packed with the necessary and suffice elements for showing you the Windows serial number.