Hi Adil
Note down the exact names of the WiFi networks you want to hide
Click your Start Button, then just type cmd
From the resulting list, right click Command Prompt and choose 'Run as Administrator'
For each network you want to hide, run this command and hit Enter, (each time change NetworkName to the appropriate network name)
netsh wlan add filter permission=block ssid="NetworkName" networktype=infrastructure
When that completes, close Command Prompt
After a restart, you should no longer see those networks . . .