Please use the latest ros revision from here: 
http://www.reactos.org/getbuilds
0.3.11 is quite old now.
You may want to read also: 
http://www.reactos.org/wiki/Debugging
Thanks.
  Date: Mon, 17 May 2010 22:37:28 +0200
 From: hlehmann(a)fh-lausitz.de
 To: ros-general(a)reactos.org
 Subject: [ros-general] prob install ff 2.0
 ros-3.11 on qemu at 17.05.10
 rapps -> Mozilla Firefox 2.0 -> install
 21:45:42.548420 IP 192.168.128.11.32768 > 192.168.128.15.53:  12575+ A? 194.71.11.70.
 (30)
 21:45:42.549838 IP 192.168.128.15.53 > 192.168.128.11.32768:  12575 ServFail 0/0/0
(30)
 whats going wrong?
 regards heiko
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