NirSoft ProduKey (portable) v1.91
Vista / Win2k / Win7 / Win8 / WinXP
You can view this information for your current running operating system, or for another operating system/computer by using command-line options. This utility can be useful if you lost the product key of your Windows/Office, and you want to reinstall it on your computer.
produkey cd-key product-id productid id ms-office windows
1License and operating system information is based on latest version of the software.