Windows 8 Activation Without cost With Simple Steps, 

1. Disconnect From Internet
2. Open Command Prompt (with administrator)
3. Copy the key

Try any of these keys:
slmgr -ipk 4TP9N-CTM6K-4RVCH-92C3W-VH3HC
slmgr -ipk QGR4N-78PMD-KCRQ7-83BXT-YG667
slmgr /ipk NYX2F-474CB-WVDH9-B3PKY-MY2K2
slmgr /ipk 2GXQN-924QG-JTRK8-9M2B9-Y7RDD
slmgr /ipk 73NQT-VDRWB-G49RR-CPTT2-XTJXQ
slmgr /ipk 9RJM4-N2MQ8-RW2Q4-3JHKT-J2KT3
slmgr /ipk BCPQN-QB33K-JH9H4-CF9VM-BBFDD
slmgr /ipk FB4WR-32NVD-4RW79-XQFWH-CYQG3
slmgr /ipk KN9W4-W3C7Q-M7Q93-V2QY6-J2KT3
slmgr /ipk NRFPP-JMBJ4-K9YQ6-3HG2V-FJMQD

4. Paste the key on Command Prompt (right click and paste)
5. Go to Activate Windows Now
6. Click "Activate by Phone"
7. Choose United States
8. Use another computer to call that number with Skype or use your Phone.
9. An Answer Machine will answer and you just have to follow the instructions.