Activation Error code: 0XC004E003 (Product key already in use)

It has been more than a year i m using genuine windows vista but suddenly microsoft asks for product activation...i did it many times but nothing happens and again n again it asks for product activation n now the dead line has passed n my computer restarts with the same product activation window i entered the key but shows the error code: 0XC004E003. I also noticed that my computer restarts every one to two hours. I m very confused plz help thanks..

 

UPDATE ON THE PROBLEM: nOW IT SHOWS MY PRODUCT KEY IS ALREADY IN USE ..I M REALLY CONFUSED.. i ve bought the software, i ve verything product code, product id, key. Is it a work of a hacker is my pc infected..???

http://support.microsoft.com/kb/950755/

Error message when you try to activate a copy of Windows Vista: "The Software Licensing Service reported that the license evaluation failed: 0xC004E003"

Try this, and take the phone Option, and hold on for a real person to explain to:

http://www.microsoft.com/windows/windows-vista/quick-start/activation-faq.aspx

 Activation FAQs at above link.

1. Click Start, and in the Search box type: slui.exe 4

2. Press ENTER on your Keyboard

3. Select your Country.

4. Take thePhone Activation option, and hold on for a real person.mm

 If locked out except for 3 choices, use the reduced functionality option to get into Windows to do the above Activation.

http://social.microsoft.com/Forums/en-US/genuinevista/threads

“Issues relating to the Windows Vista Software Protection Platform - Non-Genuine dialog boxes, validation problems, or Software Licensing Services messages.”

If the information/help supplied does not work, kindly repost your question in the above Forum.

Cheers.

You can reactivate your genuine Windows Vista installation by performing the following:

1. Click on the Start button and in the Start Search box type in:  slui.exe 4

2. Press the Enter key on your keyboard.

3. Select your Country.

4. Follow the instructions for phone activation (no charge).

NOTE: When you call that number, you will first hear an Automated Voice. If the Automated Voice gives you an option to talk to a
Live Activation Rep, select that option. If not, do not enter any numbers. This should force the Automated Voice to transfer you to
a Live Activation Rep. Trying to activate thru the Automated Voice will not work, in your case, only thru the Live Activation Rep
will your activation be successful.