No longer detetects any wireless network

Hi
My macbook was correctly connected to the Internet via my wireless network, and then it suddenly disconnected. It no longer detects any wireless networks (and there are quite a few usually!)
I tried to turn airport off & then back on, but no change.
I then tried to reboot my macbook, but no change either.
When it searches for wireless networks, it is very slow (sluggish).
I also booted on Windows 7 (dual boot), and it has *exactly the same* problem. Leads me to believe that it is a hardware problem, more than a software one..
The only recent change: I moved from the UK to France few days ago => new ISP & new router (but I doubt this could be the source...)
Is there anything I can do?
Replace the wireless card?
Thanks

By the sounds of it, I've been having exactly the same problem. I will be using my macbook and suddenly the airport will drop out for no reason. Sometimes I can reconnect but often I'll have to try a dozen times or more, with the connection timing out each time. I've actually set up two differently named wireless networks at home to solve this - for a while, if one dropped out, I could reconnect to the other one. Even this has now stopped working. I've tried flicking airport on and off, restarting the airport base stations, I even have one of the wireless networks configured as WDS sending to an airport base station within a couple of metres of where I normally use my machine. Nothing works. I've tried deleting ~/library/preferences com.apple.internetconfig.plist and com.appleinternetconfigpriv.plist and rebooting - for a few times that would fix it, but not any more.
The strangest thing, though, is that if I switch user accounts, I can access the wireless networks again no problem.
It's almost like there's something that needs flushing in the user account's wireless settings - a buffer, or a cache, or something. It'll generally only happen once I've been using the machine for a sustained period of time.
I'm running 10.5.8 with Wireless Card Type: AirPort Extreme (0×168C, 0×86) Wireless Card Firmware Version: 1.4.16.2 if that's of any help to anyone.

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I've had my macbook for just under a year now and have never had a problem seeing/connecting to any wireless networks in the past. However, over the past few days I have had issues connecting to my router. It keeps kicking me off every 15 or 20 minutes and when I try to reconnect it often gives me a timeout error. I have reset the router countless times and have even reset it to factory settings and triple checked that the firmware is up-to-date. I felt it was a router issue until this morning; it kicked me off so I reset my router and turned my airport off&on but now I cannot even see the network nor the other 10 (or so) networks that are typically viable. Since I cannot even see the wireless networks across the block anymore I seems like this has to be a computer issue (or at least the computer has to be involved to some degree).
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http://support.apple.com/kb/HT1545
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http://support.apple.com/kb/TS1398
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