you can do it by phone . Call microsoft and they will give you the activation key.
check this :
You can determine how to contact the appropriate regional Microsoft Product Activation Center by selecting the Activate by Telephone
option in the Product Activation Wizard when you install a Microsoft
product that requires activation. When you select your country or your
region, the appropriate telephone number will be displayed.
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How to access the Product Activation Wizard
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If the Product Activation Wizard is not open, follow these steps to start the wizard:
Windows Vista
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- Click Start
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- Right-click Computer.
- Select Properties.
- Click Activate Windows.
Windows XP
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- Click Start.
- Point to All Programs.
- Point to Accessories.
- Point to System Tools.
- Click Activate Windows.
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