ProduKey is a small utility that displays the ProductID and the CD-Key of Microsoft Office (Microsoft Office 2003, Microsoft Office 2007), Windows (Including Windows 8/7/Vista), Exchange Server, and SQL Server installed on your computer. 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.
OEM BIOS Key to read
1.Win+R
2.PowerShell
3.(Get-WmiObject -query 'select * from SoftwareLicensingService').OA3xOriginalProductKey