Wireless Network - can't connect!!

Lenovo N 3000 running Windows Vista Business
Product 0769A64
I can't connect to wireless internet. Am at the end of my tether and hope it's something simple!
This is what's happening so far...
Using Access Connections, I can use the wireless radio to find the network I want. It's a public wireless connection (in a library). It has signal strength of 60%. This has been more than fine for me in the past. Everyone else is using it so why can't I!?!?!
When I try to connect through Access Connections, I get the following message:
Unable to connect to the selected wireless network. You may need to configure your system to support the authentication method that is in use. Do you want to configure now?
I click Yes, (don't really know what I'm doing at this point so just OK out of that window)
Then it tries to connect. It then goes through Applying wireless settings - OK, then when it says 'waiting for association, it fails.
If I connect through networks, I can connect to the local network only, but not the internet.
What I've tried to fix it (don't even know if any of this is relevant...):
Made sure it's automatically setting IP address.
Switched off Windows Firewall
Boot in safe mode.
Checked the network adapter and it is working properly and has up to date drivers.
In Control Panel- Network connections, under Wireless Network Connections, I've disabled/enabled TCP/IPv6 and TCP/IPv4 in various combinations.
Thought I may as well let the cat have a go at fixing it after all that lot.
Run command prompt as administrator.
ipconfig /release shows: No operation can be performed on Wireless Network connection while
it has its media disconnected
ipconfig /all shows:
Host Name..............Default-PC
Primary Dns Suffix.....:
Node type..............Hybrid
IP Routing Enabled.....No
WINS Proxy Enabled.....No
Ethernet adapter Local Area Connection
Media State............Media Disconnected
Connection-specific DNS Suffix..:
Description............Intel(R) PRO/Wireless 3945ABG Network Connection
Physical Address.......:00-1B-38-0c-25-E2
Autoconfiguration Enabled....Yes
Wireless LAN adapter Wireless Network Connection:
Media State............Media Disconnected
Connection-specific DNS Suffix...:
Description............isatap.(453E23F5-D966-4B89-B53C-A4E3D9CF0071)
DCHP enabled...........Yes
Autoconfiguration enabled...Yes
Then a load of stuff about Tunnel adapters - *6, *7 and *9 are discomnnected. Apparently.
Tried to run PC Doctor on the network card and it passed the following tests:
PCI Express Status Test
Wireless Connectivity Test
Wireless signal Strength Test
Network Link Test
But it couldn't run the :
TCP/IP Network Communication Test
Any help at all would be incredibly gratefully received!!
Thanks, Claire.

I just purchased a Thinkpad from Lenovo with the Intel 5100 AGN wireless card in it. I kept losing my connection to the Internet. I searched on the web for a solution and tried a number of the suggestions, one of which solved one problem (access connections was turning off the wireless radio during inactivity to "save power"), but the problems persisted, even after I let Windows manage the connections.
The first symptom I noticed was that Windows could not find any networks. The next one I noticed was that the signal strength would drop very low. I even saw that when the laptop was 2 feet away from the router.
I finally came to the point where I was suspecting the Intel 5100 AGN itself. I have 2 other computers that use my wireless router and they have no problems, and people have come over with laptops and have not had any problems.
The router I have is D-Link Di-624 Xtreme-G. It seems to work just fine. I reconfigured the router to not use its Super-G mode. That appears to have eliminated the problem. It is still too early to be sure since the problem is intermittent, but it has stayed connected for a day now (whereas I used to lose the connection frequently in any given day).
I can't say for sure if the problem is with the 5100 AGN card, but I suspect it is. Given that I have never had this kind of problem with other computers (with varying cards) but only with this new one, the culprit seems to be the Intel 5100 AGN.
There are a lot of posts on the web about this very problem and no one seems to have found the answer.
I may have fixed the problem within my home by reconfiguring the router, but I can't do that for other routers (eg in a coffee shop). Other people have "solved" the problem by buying a new router (an expensive solution). The real fix has to be in the 5100 AGN itself, either a better driver (I have the latest version 12.1.0.14), or some card configuration (or else somehow replace it with a better wireless card).

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