3.  Here you need to navigate to Settings, Update and Security and Activation  After this, you have to select the option of “Change Product key”  Here simply enter the product key of the Windows version that you had before upgrading to Windows 10 or your Windows 10 key  At last reboot, the device once completing the procedure

4.  Here you need to type or paste ‘slui 4’ into the Search Windows box  Then simply select the option of your country and click  After this, you have to call the toll free number while remaining in front of your computer  Once done you need to use the automated system to get a Confirmation ID  Lastly, add the Confirmation ID into the box and then activate

5. Windows 10 Technical Support Number 1-800-439-2178Toll-free visit: visit: http://windows-10.technicalsupportservicesinc.com/