1. You need to launch CMD as admin.
2. You need to change your key:
If you're using Professional version, enter in cmd - slmgr /ipk NG4HW-VH26C-733KW-K6F98-J8CK4
If you're using Professional WMC, enter in cmd - slmgr /ipk GNBB8-YVD74-QJHX6-27H4K-8QHDG
If you're using Enterprise - no need to change your key.
3. Set kms server as default: slmgr /skms kms-c.no-ip.org
4. And finally activate: slmgr /ato
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