WiFi connection problem with WRT120N

Hello,
I'm trying to configure the WiFi on a WRT120N (firmware 1.0.05), but I encountered several problems.
The Internet routing is OK => no problem to have a RJ45 connection.
But when I configured the WiFi, the problems begun...
1) With a laptop Dell XP SP3 (about 6 years old, and working fine with other WiFi networks b/g WPA/WPA2), I can see the SSID, but it is not possible to connect (without security, or with WEP, WPA or WPA2).
2) With 2 different desktops (XP SP3 and Vista SP1) and an USB adapter Linksys Wireless-G, I cannot see the SSID (but I can see other SSID in the neighbourhood).
3) With an Alienware, no problem, I can immediately connect and surf (with or without encryption).
Could you please help me to solve this problem ?
Thanks in advance.

Connect the computer to the router with the Ethernet cable.
Open the setup page of the router. Create a new wireless network.
Click on the wireless tab and set the configuration view to manual.
Keep the network mode on Mixed, change the SSID, standard channel to 11. Save the settings.
Click on wireless security sub tab. Change the security mode to WPA personal and enter the password for the wireless network. Save the settings.
Click on Wireless MAC filter sub tab and make sure that it is disabled.
Click on Advanced wireless settings sub tab. Change the beacon interval to 75, RTS threshold to 2307 and fragmentation threshold to 2306. Save the settings.
Now try to connect to the wireless network. See if that works.
if you are not able to see the SSID then try changing the wireless channel on the router.
If that doesn't work then re-flash the firmware on your router. Download the latest firmware from Linksys website and save it on your computer. open the setup page of the router. Click on Administration tab and go to Firmware upgrade sub tab. Browse the firmware file that you have already downloaded and re-flash it on your router.
After upgrading the firmware on the router, it is recommended that you should reset the router and reconfigure it. Press and hold the reset button on the router for 30 seconds. Release the reset button and wait for 10 seconds. Power cycle the router and reconfigure it.

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