How to setup once an Airport home network and keep it alive?

Hello!
I have the following hardware setup:
1 - A Macmini 2009, Ethernet wired to my router which allows the connection to the internet;
2 - An HP Deskjet printer, USB connected to the Macmini;
3 - My wife's laptop PC, WiFi connected to my Mac.
My Macmini handles the internet connection the traditionnal way (Ethernet and PPoE) and has a static IP on it.
(Why a Static IP? Because I run my own Webserver.)
I set up a WiFi Home Network in order to allow my wife sharing both my Internet Connection and the Printer Connection.
Everything run well: fast and smooth. The PC has Internet and Printer access.
Problem is:
After each restart, I must re-create the Airport home network.
System Preferences-->Airport doesn't memorize the name, parameters and credentials of this network.
How can I fix this?
Many thanks in advance for your replies!
Best regards
Gerry

If your router is wireless, you should probably use the laptop to configure it to take care of the network (i.e. have the router distribute the IP addresses). Then you can connect your computer to it via the LAN port on the router. Otherwise, you would have to set up your computer to "share its Internet connection" (via Preferences/Sharing or Preferences/Network not sure). I don't think you need to create a network for this.

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