WiFi works on one network but not on an old and simple

[hannupuhakka]

I installed Linux Mint several days ago. I can use wireless on my office wireless network, but on my home network it does not work. Network settings sees the right network (M/MW1122, old Nokia ADSL modem with wireless) The wireless network is functioning and can be used by Windows computers (Working Windows XP settings: Network Authentication: Open, Data encryption: Disabled).

sudo /usr/lib/linuxmint/mintWifi/mintWifi.py

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* I. scanning WIFI PCI devices...
-- Intel Corporation PRO/Wireless 3945ABG [Golan] Network Connection (rev 02)
==> PCI ID = 8086:4227 (rev 02)
-------------------------
* II. querying ndiswrapper...
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* III. querying iwconfig...
lo no wireless extensions.

eth0 no wireless extensions.

irda0 no wireless extensions.

wlan0 IEEE 802.11abg ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=15 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off

-------------------------
* IV. querying ifconfig...
eth0 Link encap:Ethernet HWaddr 00:16:41:16:28:a2
inet addr:192.168.5.5 Bcast:192.168.5.255 Mask:255.255.255.0
inet6 addr: fe80::216:41ff:fe16:28a2/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:14249 errors:0 dropped:0 overruns:0 frame:0
TX packets:8918 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:19317101 (19.3 MB) TX bytes:854820 (854.8 KB)
Interrupt:16 Memory:ee000000-ee020000

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:16 errors:0 dropped:0 overruns:0 frame:0
TX packets:16 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1296 (1.2 KB) TX bytes:1296 (1.2 KB)

wlan0 Link encap:Ethernet HWaddr 00:13:02:0e:7d:e7
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

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* V. querying DHCP...
RTNETLINK answers: File exists
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* VI. querying nslookup google.com...

[remoulder]

What version of mint have you installed (inxi -S) and have you made any changes to any networking components or files?

[hannupuhakka]

Version:
hannu-ThinkPad-T60 ~ $ inxi -S
System: Host hannu-ThinkPad-T60 Kernel 3.0.0-12-generic i686 (32 bit) Desktop Gnome Distro Linux Mint 12 Lisa

I have not made any changes to networking systems.