Macbook deleting WIFI details when closing down and start up.

Hoping someone might be able to help, i'v got a new macbook and have managed to set up the wireless network connection, and it's working fine.
My problem is that when i restart my macbook all the wireless internet connection details have been erased and i have to go through and set it up again each time!!!
It doesnt happen when i close safari and open a new page, its only when i close down and start up the whole computer.
I'm thinking it is something to do with the system setup for the wireless network connections, but i haven't been able to figure it out.
(i'm quite new to mac's so ANY help would be greatly appreciated.)

Sounds like a corrupt preference file. I'm not at my Mac at the moment otherwise I'd suggest something to look for. You'll find the file in Users>Library>Preferences. I don't think it's the Finder's (com.apple.finder.plist), but it might be something like com.apple.wireless.plist. Have a search for something and see what shows up. Simply drag any file to the desktop and log out/back in. If no change, then put it back and choose replace if asked.

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