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The key sticker should read whether the key is for Home or Pro edition. If you have trouble loading the key. Remember that the font used may be difficult to distinguish between '8' and 'B', 'I' and '1', or other similar characters.

Call Microsoft and describe the trouble to them, they may condescend to issue you a replacement key (since it's obvious you bought a license with your laptop).

Otherwise, use Linux or buy a new key...