Why is MB Air the only one out of my 5 computers having wireless problems?

When I was having problem connecting to my wireless network at home, I bought a new wifi router. That did not help. I have PS3, 2PCs, and iPhone connecting with no problem. Just this Mac Air does not. Sometimes it works and sometimes it dies not. It sees other networks in our building, but not mine.
I am using 128bit WEP.
Judging by the amount of postings on the Internet, I am not alone, but there was not a definitive answer. I am not a novice and tried all reasonable ways of getting it running.
Any real advice would be appreciated.

I have been having problems with wireless connectivity, too, and never really isolated the problem. I live in a small college town and the WiFi density is pretty high. I am using an Airport Extreme Base Station with an Airport Express in WDS mode. The AE does not allow wireless clients. I made some changes to my setup and I know my network improved after these changes, though I can't say the changes are what caused the improvement.
I had been using channel 1 and switched to channel 10. I also decreased the multicast rate from 11 Mbps to 5.5. I also logged on to my closed network using WPA2 Personal rather than WPA Personal which I had been using previously. I also began using "interference robustness". I made these four changes all at once and my WiFi disappeared completely. I rebooted the AEBS, the MBA could again log on to the closed network, and everything has been fine going on three days now.
My recommendation is to try fiddling with the strength of your network and to try to find a channel that is not crowded.
These network issues are hard-to-track and frustrating, so I wish you the best of luck. But I'm with you in that my MBA seems more finicky about wireless than the iBook G4 it replaced.

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