As you using Windows 8 and want to know Indian Institute of Technology Kharagpur, KMS activation steps here I will let you know.

Here telling you some steps for KMS activation
Log into the machine with an account that has administrative privileges - the Administrator

Please make sure that the Time Zone is set to (UTC+05:30) Chennai, Kolkata, Mumbai, New Delhi

The time and date of the KMS Client should be in synchronization with the KMS Host

Open a Command Prompt window as Administrator. Press the START icon, in the box type CMD. A window will open showing CMD at the top. Right click on CMD and choose 'Run as administrator' from the menu. Please be sure that the word
'Administrator' appears in the title bar of the window.
Administrator: C:\Windows\System32\cmd.exe
At Command Prompt window, verify that the current directory is C:\Windows\System32.
If it is not, type

CD \Windows\System32 and then press Enter

Type the following command:
cscript slmgr.vbs /skms kms.iitkgp.ac.in:1688 and then press Enter
cscript slmgr.vbs /ato and then press Enter

Close the Command Prompt window

Address:-
Indian Institute of Technology Kharagpur
Kharagpur, West Bengal 721302

Phone:-
03222 255 221