How to secure my internet connection?

I have a linkseys wireless router which I use for my macbook and my two other imacs at home. The internet is really fast with the imacs, but so much slower with my macbook. Even when the two imacs are off and im only using the internet on my macbook, it is still considerably slower most of the time! Is it because I didnt secure my internet connection and other people might be using it? And it always shows a strong signal so I have no idea why the internet is so much slower on my macbook than on my imacs.

It doesn't make sense that your iMac's are working fast but your MacBook is not with respect to people stealing (or rather using) your Internet connection. I'm thinking there's a configuration problem with your MacBook.
I'd first like to say, do you realize you are responsible for what happens through your Internet connection?
Now let's get you secure.
Linksys makes some good stuff, but first let me understand more about your network. I'm assuming all three of your Mac's are wireless. If so then you'll have to secure all of them.
Depending on the age of your Linksys you could have a few options for securing it. I'll go in order of most secure to least secure.
1. WPA2 Personal encryption. If you can set this on your router, great. If not continue on...
2. WEP encryption. Better than nothing
3. No encryption but turn off SSID broadcasting. this makes your network hidden from casual users. Note: not from hackers!
Okay, you'll need to connect to your router. Usually 192.168.1.1 for Linksys. The login account will be admin with no password (or use password for the password). Sorry it's been awhile since I hacked into, er rather used a Linksys router.
Just open your web browser and type in the routers IP address (if you look at your network TCP/IP settings, the routers IP will be listed under, well... router.
Okay once you are connected to the router it should have a web based configuration. This is where you'll turn on encryption and turn off the SSID broadcast.
It would be best if you post back and let us know you've made it this far and to clarify any questions you have.
Greg

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