How can I activate my product?

"whenever I try to upgrade to 10 window, the computer tell me that I need to activate my product which is windows 7, it shows me a lot of choice, I choose ' activate my product online"and then he said"a problem is occurred when windows tried to activate. 0xC004C020 error code ' what should I do?

Have you tried to restart by phone?

How to activate Windows 7 manually (activate by phone)
 
1) click Start and in the search for box type: slui.exe 4
 
(2) press the ENTER"" key.
 
(3) select your "country" in the list.
 
(4) choose the option "activate phone".
 
(5) stay on the phone (do not select/press all options) and wait for a person to help you with the activation.
 
(6) explain your problem clearly to the support person.
 
http://support.Microsoft.com/kb/950929/en-us

Please run the Microsoft Genuine Diagnostics Tool then copy and paste the results into an answer here for further analysis:
http://go.Microsoft.com/fwlink/?LinkId=52012

Tags: Windows

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