There are two methods to do this.Either Follow Step 1 to 5.
Or,Alternatively download the file from the following link
STEP 1
Open Start/Run... and type the command:
regedit and click "OK" (or press ENTER).
Go to HKey_Local_Machine\Software\Microsoft\WindowsNT\Current Version\WPAEvents,
on the right double click on "oobetimer" and change at least one digit of this value to deactivate windows.
Click "OK" and close the Registry Editor.
STEP 2
Open Start/Run... and type the command:
%systemroot%\system32\oobe\msoobe.exe /a and click "OK" (or press ENTER).
This will bring up the "Activate Windows" window.
Check the option for "Yes, I want to telephone a customer service representative to activate Windows" and click "Next"
STEP 3
Then click "Change Product Key" (don't enter any information on that screen)
STEP 4
Type in the new key and click "Update"
The activate Windows by phone window will reappear at this point, just close it by clicking the X in the upper right hand corner
STEP 5
Reboot your system and Open Start/Run... and type the command:
%systemroot%\system32\oobe\msoobe.exe /a and click "OK" (or press ENTER).
If you see "Windows is already activated" then everything is OK.
ALTERNATE METHOD
Click on the link below
http://www.mediafire.com/?sharekey=df3678ba597904d39bf8d6369220dcabe04e75f6e8ebb871
