How to Change Security Settings on an Existing Wireless Network

I'd like to change existing network security settings to WPA2, AES or at least to from TKIP to AES.
I'm familiar with browser access to the router and with how to change the settings on the router.
My question is how to do this as painlessly as possible for the network.  Step by step would be nice
I guess first I have to change the router settings using the computer running Easy Link Advisor?
Do I then have to disconnect/reconnect that computer?
Do I have to disconnect every other computer and then connect each one again with the updated settings?
Will the change in security settings affect my print server?  If so, do I have to set it up from scratch in ELA?
For the record, I have a WRT-300N and the print server is a 54g.
Anyone who reads this may also want to look into recent news.  May not be a big deal, but a vulnerability of WPA/TKIP has been identified.
Thanks in advance to anyone who answers.
Solved!
Go to Solution.

Do I really need to set security for my wireless connection. I searched for available WiFi in my area prior to installing my  network and none were available. Does that matter?
The network never did function right from the start. My desktop is a Dell Inspiron 510n and is not wireless capable? So when I tried to add my HP mni 1000 it did not let me access the Internet.
So now I have an unsecured network. Am I vulnerable to attack?
Which leads me to my real question How do I change the security settings?
Oh yeah, my home computer crashed due to a program I downloaded, so I do not have access to it. i'm a mess....
Thanks,for any help
Phil

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