Can’t get laptop on the net over a LAN

Hi All,
I have just got a dell latitude laptop and finish configuring it to hand over to my boss but one problem.I can’t get it to connect to the internet over a LAN.I am sure my settings are correct as i configure these all the time.but its the first time am configuring a laptop with xp pro,i have done it with win 2000 pro and xp pro on desktop.

my configuration is as follows:
1.assign ip automatically
2.preferred dns.205.215.191.200 (isp)
3.ip settings (gateway)205.214.108.9(firewall)
4.append primary connection & specifc dns suffixs (tick)
5.append parent suffixs of the primary dns suffix (tick)
I also edit this file (c:\windows\system32\drivers\etc. and add ip and domain.

this is what i will normally do on ibm & dell desktop with no problem but for some reasons this dell laptop is gaving me the display page.

please help