Here is the activator for windows where you can activate all the new Windows 7 windows 8 windows 8.1 office 2010 and office 2013...

By:Amandeep singh chawla

• Windows 8 and 8.1
• Office 2010 and 2013

1. Download the zipped file from the above link. (320 KB Only!) 
2. Unzip the file. (You can read the instruction file)
3. Run the KMS 8.1 as Administrator.
4. Look at the KMS Screenshot below.
5. There are mainly three options: 1. Windows  2. Office  3. Both
6. Press either 1, 2 or 3 as your need and hit Enter.
7. When you press the key, suppose 1, operation will start. Let this work.
8. While running this for the first time, you might be supposed to allow something.
9. After successfully installing the KMS on your system, you will get the confirmation message. 
10. Close the window and check your activation status from System Properties. (Press Start + Pause to open System Properties)