Problems Downloading Files on XP Guest, Mac Host

[sun]

Hi,

My Virtual Box is working fine.
A Win XP System on a Macbook on mac os 10.4.

Guest additions installed and it seems to work.
I am able to surf as I am writing this on Win XP.
But downloading files with firefox or IE does not work.
It tries to start the download but nothing happens.

Using NAT of course.

what might solve this problem?

sun

[sun]

conected my macbook to Ethernet instead of WLAN and it worked.

I Thought WLAN was a problem vor HIN and bridging but not for NAT?