If one wants to decipher the activation key of his running Windows, there is actually more than one way - rather tool, one can use.
Speccy, Belarc Advisor...... these require to be installed.
"SIW without installer" is more elegant. Just download the SIW.exe file from SIW | Download
(go to the bottom of the page) and click on it. You can even run it from your pendrive. Just try it and then explore it.
OT: My 100th post was dedicated to Shark 007. This 200 I dedicate to Dave76.