All the security you need for the most part is changing the password from the default on your router, and using NTFS permissions on each share within the network. If you are using Wireless, make sure it is encrypted with WPA if possible, or at least WEP, as MAC Address filtering is not enough by itself.
Also ensure that ALL usernames have passwords used on your network.
If you have any other specific questions related to security, please post back
Thanks guys i did that and its working great =) but i have a big problem now. For the past few days i've been experiancing my internet's speed deteriorating. Its been going slower and slower. I can't take it, ever since i had change my router to this linksys i have had nothing but problems. No one is leaching off my network. Not just my computer, however all my computers are experiencing this. Is it becuase im running bittorrent on my computers? But it isn't using much bandwith only 3 downloads. Is it maybe becuase i messed with a port? i only opened about 4 ports. all gamming and torrent ports. Any Ideas on why my internet is so rediculously slow?
Ep, glad to see you come back and tidy up...did want to ask a one day favor, I want to enhance my resume , was hoping you could make me administrator for a day, if so, take me right off since I won't be here to do anything, and don't know the slightest about the board, but it would be nice putting "served administrator osnn", if can do, THANKS