Wireless network (intel 3945) with hidden SSID working with Vista but not with XP

Hi,

I have my wireless network configured with hidden SSID and WPA-PSK security enabled. It has been working fine this way for years with my old laptop (it had an intel 2200 adapter and XP SP2). Now my new Toshiba laptop (Satellite A100-383, Intel 3945ABG, dual boot Vista and XP SP2) can connect automatically to the network when running Vista with no problems at all, but it can´t do it when running XP.

I noticed I can force XP find the network and connect to it if I run the XP wireless configuration assistant, and after that, XP re-connects automatically to my network (although rather slowly). But the problem is that after 3 or 4 reboots, XP is unable to find the network and connect to it again, and I need to run the XP wireless assistant again to fix it.

I know all this thing sounds weird, but I reproduced this behavior a lot of times. I have the most recent Intel 3945 drivers for XP to date (11.5.0.32). I know that my problem could be solved if I unhide my wireless SSID (I also know that a hidden SSID does not improve security substantially), but i think that if it worked with my old laptop and XP, and if it´s working also with my new laptop running Vista, it SHOULD work flawlessly on the same laptop with XP...

Thanks in advance.