Airport refuses to connect to selected "Specific Network"

In Network under System Preference, I have my home wi-fi selected as the "Specific Network" on the Airport panel. About half the time the MBP wakes, it will connect with a neighbor's wi-fi. I've restarted the machine, changed the setting and restored it. Nothing works. This started acting up only a couple weeks ago. I've had this MBP since December.
MBP 15" C2D   Mac OS X (10.4.9)  

Thank you, BDAqua. Creating a new network location solved my problem. I would've replied earlier; I wanted to be sure it continued to work over a few days.

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    4) try changing broadcast channels. You may have a neighbor on the same channel which blocks reception - I know, why this computer and not others? Voodoo
    5) open your Network preference tab and select Airport. Delete any preferred networks you find and make sure that ask to join new networks is checked
    6) create a new account and see if it has any better luck connecting. Last spring I struggled with a computer for several days and one of my IT students suggested this pointing out that I suggest it for many other troubleshooting issues. Darn smart aleck student! Obviously at some point the admin's network prefs got munged and everything I tried after that was for naught.
    Good luck

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