Airport Express Password Security

[ayee007]

I changed my password on my airport express and the next day I see other computers on my network. I'm not sure how thats possible if I just changed it. I changed it again and other unauthorized computers are logged on. How can I boot them off my network and prevent others from getting on it?

 

[QuarterSwede]

Are you using WEP?

 

[ayee007]

WPA/WPA2...

would completely resetting my airport express do the trick? i have wireless printing set up through airport express, would i need to reinstall and hook that up again?