Enabling WEP encryption will stop the casual hacker from using your wireless network.  Still there are other steps you need to take for better security.  See my answers to a general security question in the following thread:

http://forums.us.dell.com/supportforums/board/message?board.id=dim_network&message.id=40666

Steve

Just another small step.  If the network cannot be seen, then it just makes it a little more difficult to break in.  Again, nothing is 100% secure, but every step helps a bit.

Steve

Find the MAC address of your network card by going to Start > Run and typing cmd then clicking on OK.  In the command prompt window that opens type ipconfig /all then hit the enter key.  The MAC address of your network card will be listed as the "Physical Address".  Write it down and make sure you have written it down correctly and make sure you write the down the address for the wireless network card, not for the ethernet card.  Then get out your router manual and find out how to enable MAC address filtering.  You will have to enter the MAC address of the network card into the table of allowable MAC addresses.  If you ever in the future want to add another computer to your wireless network or a different computer, you will have to enter the MAC address for those network cards as well.

Steve 

Thank for the help

 I did what you said and hidden my ssid. The day you reply.But today my computer was left on and I when to turn it off There was a warning from windows that someone is using my web and computer.Is there anything else that I need to do to stop this person or persons from doing this???  Also it said that if you turn off the computer this person will lose all on save data.

Message Edited by kain123 on 05-18-2005 08:13 PM