How to activate windows without reinstallation

Using the registry, you can remove the old serial key and replace it with a new genuine one without reformatting your computer and loosing your files. Here's the step:
1. Start
2. Run
3. type regedit
4. Click the plus of HKEY_LOCAL_MACHINE, Software, Microsoft, WindowsNT, Current Version
5. Highlight WPAEvents
6. on the right click OOBETimer
7. Modify
8. change at least one digit on the Value Data Text Box. This process deactivates windows.
9. apply, ok, close the window
10. Start
11. Run
12. type this %systemroot%\system32\oobe\msoobe.exe /a
13. Windows Product Activation window will come out then select Yes, over the telephone
14. select change the product key
15. after all is done, restart your computer.

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How to activate windows 7 by phone

I have the genuine cd, I installed the windows7 in parallel with Mac, but unfortunately, through the internet when I'm activating it, it says it cannot proceed, either I need to type a new product key or purchase a new one.
There is an option to activate it through phone by dialing 800-4089 (in UAE) but this option is not coming out. So how can I use the phone to activate it, since through the net, it is not working? Here is the solution.

Click Start, go to Run, then type this: slui.exe 4

then press the Enter key. You will notice that a dialog box will be opened for you to activate the windows through telephone. All you need to do is to select your location then dial the toll free number.

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