Windows 7: Wireless problem with a Mybookworld NAS

I've just installed Windows 7 7100 on my DELL mini and I have some problems accessing my NAS using a wireless connection.

My home network is formed by a wireless modem-router Thomson Speedtouch ST780 (soft. ver. 6.2.17.5), a WD MyBookWorld (a Samba server with two shares: one public and one private) linked to the router, a desktop PC running Windows 7 7000 and the DELL mini netbook.

I have no problem accessing the NAS from the desktop. The XP that was in the netbook had also no problem accessing it using the WLAN.



Now, when I connect the netbook with Windows 7 to the ethernet port of my router, everything is OK: I can browse the shares both in the NAS and in the desktop.

Then, when I connect the netbook to the WLAN, something strange happen:
First, I can't access my private share on the NAS; BUT I can still access the public one, always in the NAS, and also the shares in the desktop are accessible. When I double click the icon of the share in the explorer, it asks for the credentials and than it takes a couple of minutes to tell me that the share is not accessible ("The specified network name is no longer available).
Second, I can't access the home page of the NAS, with Firefox or IE. In both cases I get a "waiting for..." status and nothing happen. I have no problem to browse internet and I can still access the NAS via ssh and ftp.

I am not sure if the two thinks are related, but as I stated before, when I switch to the wired connection, I can browse again the private share and also browse the NAS admin page.

So, this is a list in random order of what I have done 'till now (sorry If I forget something but I really tried a lot of different stuffs):
Updated the wireless drivers (Broadcom 802.11g Network Adapter), and rolled back to the Microsoft drivers, just in case...
Switched between home and work network,
I closed the windows firewall and there is no antivirus (clean install),
Removed the IPv6.
Using the IP instead of the NAS name make no difference.
Changing the security settings (128 bit encryption and auth. level) doesn't help (in any case with the wired link they are working well...)

And, this is a tough one to finish: if I use putty to portforward the http port (80) in the NAS to the netbook, when I try to connect to localhost:80 I get a putty fatal error: "network error:Software caused connection abort" In the desktop I can easily access the web page with and w/o the port forwarding.

I really don't understand what is happening... any help is appreciated!

(let me know if you need more info or some screenshots!)