login to RDP(assuming that how your logging in).

hit start
hit run
type mmc
hit enter
hit file
hit add/remove snap ins
at the bottom hit add
go down till you see Routing and remote access & double click it
hit ok
right click hit add server
choose this computer
hit ok
it may ask you to install if it does just let it install
should come upto a configutation page
hit “Custom Configuration”
hit next
click “Nat and basic firewall”
hit finish
if it asks you to start hit yes
expand Ip routing
hit general
right click on the connection you wanna block the ip on
hit properties
hit inbound filters
hit new
click “source network”
put in IP Address and subnetmask FYI (255.255.255.255 is per single IP)
dont check destination network and keep protocol as any
repeat by hitting new and completing that per ip
hit ok
hit apply
hit ok

and your done.