Note: If you have recently installing the Windows 7 and in the installation period you are asking to insert the Windows 7 product key then go and put there key.
If the product key used to activate Windows 7 has been changed it will no longer activate against LSU's activation server. A Windows server KMS host key can be used to activate Windows clients. Obtaining MAK Keys When KMS Is The Default As previously stated, KMS is the default Volume Activation model for operating systems released after Windows Vista, including Windows 7. To activate by using the telephone, type slui.
