I can't activate my windows, although I activated it onse with the same product key. Why is it so?

I bought a windows 7 home basic a year back, but I installed once and I use it for a long time. but after hearing the realiese of windows 8 I tried versions previews and the trial of them had obtained more so I wanted to tur back to windows 7 Home Basic but wasent product activation.

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

Tags: Windows

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