Acer Extensa5220 - wifi problem

Hi ALL,

I have a problem with my Extensa5220 to connect to wireless network.
The laptop was bought 4 months ago with linux, so I installed XP HE SP2. All drivers taken from Acer ftp installed correctly. All updates installed from WU. Wireless Card is BroadCom 4311
For 4 months I did not have any issue with it. In May I installed SP3 and no issue discovered, but 3 days ago I decided to change a password for my wireless network (use WPA) and problem has started. After that I cannot connect to my network. I have wireless router D-link DI-624 54Mb. I tried to repair connection but the message is that cannot connect to wireless network.

I decided to uninstall SP3 - the same problem. Then I made clean XP SP2 installation with drivers only and the same. Sometimes connection is established but only with speed 5,5 Mb but after reboot I have again red cross on wireless icon. I installed Vista and looks like connection is established but with speed limitation 5,5 Mb.
The funny thing is that I have two laptops. Second one is HP9780 with Vista and there all is OK. Connection speed 54Mb.
Do you have any idea what can be wrong?

 

Don't crosspost. You posted this in the Acer forum.

 

Thread closed for cross posting. Cross posting is against the forum rules.