The best way to block anyone from using your wireless connection other than putting a WEP Key and enabling Restricted network is to use your MAC address or whst called MAC Address filtering.
Every Ethernet or Wireless WLAN on laptops and desktops, has a MAC address.
Go to START, click on RUN and type
cmd
then type
ipconfig /all
You will gte whats called a Phyiscal Address or MAC address .. Example is below:
Ethernet adapter Local Area Connection:
Connection-specific DNS Suffix . : domain_not_set.invalid
Description . . . . . . . . . . . : Realtek RTL8139/810x Family Fast Ethernet NIC
Physical Address. . . . . . . . . : 00-0A-E6-13-AE-9B
Go to your Router Systems Administration page by opening up the web browser and putting in the router IP address.. For example:
http://192.168.0.1
This will bring you to the Router COnfig page where you can customize your settings.. Go to the Wireless section and put in the MAC address in the MAC filtering section.. add it, save it and restart the router
If you want specific steps, let me know what the Speedstream Router Model number is and ai'll see if I can get you detailed description
Adding MAC addresses in the MAC Filtering section allows only those computers whose MAC addresses have been added to access the internet making it safe.