If it works on the wired it will work on the wireless.
Now go through StuartBe's post on how to secure your wireless network.
http://www.cableforum.co.uk/kb/78/ho...reless-network
For linksys specific help
http://linksys.custhelp.com/cgi-bin/...dXJpdHkg&p_li=
You may want to look at these links for getting WPA-PSK functionality onto the laptop if it does not have it.
http://www.cableforum.co.uk/board/sh...131#post282131
Specifically post 7
http://www.cableforum.co.uk/board/sh...31&postcount=7
Think about what you are sharing on the PC make sure you are not sharing the whole of a drive, but the necessary parts like My Documents etc.