Question : Can't access web-sites, but MSN, ping works!

Hello Experts,

This one got me stumbled...
I can PING domain names, MSN works, but IE or Firefox cannot load web-sites!

Friend's PC:
Windows XP SP2, Comcast cable modem connected straight to the computer w/ Ethernet cable.
Internet Explorer, Firefox3 opens up, but 'Server Cannot be found' page appears.
At first i tried using Firefox2, and it worked well!! But then i updated to Firefox3, and no more connection!

Problem occurred once Linksys router was removed from the LAN.

Comcast tech came over, and could access the WEB using his laptop.
I can PING web-sites, and MSN messenger loads and works well.
Computers gets dynamic pubic IP assigned by Comcast.
I tried disabling firewall, reinstalling IE7, settings in Windows Networking seem fine.
There aren't any blockers or additional firewalls installed to our knowledge.

What tha hell!?

Thank You.

Answer : Can't access web-sites, but MSN, ping works!

Bad uninstall of any net-nanny type security will almost surely lock down your system, so if they had kids or spouses trying to get around something, ouch, reformat and reinstall.

You may want to confirm NIS was removed fully by using the Norton Removal Tool from Symantec.

See this page to get a download of it from Norton's.
http://service1.symantec.com/Support/tsgeninfo.nsf/docid/2005033108162039
You will have to follow one of the links from that page to get to the Download of their program.
Or you can follow the directions here.
http://www.bleepingcomputer.com/forums/topic42247.html which has a direct link to the Norton Removal Tool as well.