how to use laptop as hotspot

run command prompt as admin

1- netsh wlan set hostednetwork ssid=testwifi mode=allow key=12345678

(key should be in 8 characters)

2-netsh wlan start hostednetwork

this command will create a virtual interface like ( local area connection* 4)

now you wifi router is enabled

if you wants to share your internet connection with others 

then right click on your lan connection and go to the properties

then sharing 

then internet connection sharing 

then check the check box of allow other network users to connect through this computers internet connection 

then select yout connection like ( local area connection* 4)