Below are the keys which were required to enter while you are using the Refresh and Reset features in Windows 8 operating system.
6RH4V-HNTWC-JQKG8-RFR3R-36498
For those who are using the Developer version of Windows 8 Server, they can use the following key
4Y8N3-H7MMW-C76VJ-YD3XV-MBDKV