Mouse down to bottom left corner. Right click on the Start/desktop button.
Click "Command Prompt (Admin)" and type in these 3 commands at the command prompt:
slmgr /ipk NG4HW-VH26C-733KW-K6F98-J8CK4
slmgr -skms kms.creighton.edu
slmgr -ato
You should now be activated as the last popup window tells you. Big thanks to cRackk_69 for the kms server info

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Description
This is Windows 8 PRO build 9200 x64 and x86.If you use the activator in this release it activates windows but it doesn't allow you to personalize.

for activation of windows 8
=======================
Mouse down to bottom left corner. Right click on the Start/desktop button.
Click "Command Prompt (Admin)" and type in these 3 commands at the command prompt:

slmgr /ipk NG4HW-VH26C-733KW-K6F98-J8CK4
slmgr -skms kms.creighton.edu
slmgr -ato

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Activating Microsoft Windows 8 Pro for free with legitimate key!!!
Yes you heard it right, its possible now just follow some of these simple steps:

1). Activate your copy of windows with a MAK or KMS method
2). To activate windows using KMS server, run Command Prompt (CMD) as Admin
and enter the following in the given order:
slmgr /ipk NG4HW-VH26C-733KW-K6F98-J8CK4
slmgr /skms 147.134.1.42:1688
slmgr.vbs -ato
slmgr /ckms
If the server is running then you will be activated for 180 days.
3). Visit http://windows.microsoft.com/en-US/windows-8/feature-packs and get
your legit free key for an upgrade to Windows 8 Pro with Windows Media Center.
4). Now right click on extreme lower left corner of your screen and go to "System".
5). Click on "Get more features with a new edition of Windows" and
select "I already have a product key", enter the key and follow
the procedure to make your Windows legitimately activated!

NOTE:
1). Free upgrade offer is valid till 31 January 2013, so hurry up!
2). This method works only with Windows 8 Pro Retail.
3). Activation using this method is FOREVER !!!
4). The WMC promo-key is FREE (see the link above).

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For Win 8 Professional:

Run the following in a command prompt with Admin rights:

slmgr.vbs -ipk NG4HW-VH26C-733KW-K6F98-J8CK4
slmgr /skms kms-c.no-ip.org:1688
slmgr.vbs -ato

Key to install Media Center(after you've installed Win 8 Pro):

RR3BN-3YY9P-9D7FC-7J4YF-QGJXW

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                                                                                       [Try this at your own risk]