Computer suddenly can't connect to any internet or intranet site using any browswer

I have a customer’s computer that suddenly can't connect to any internet or intranet site using any browser.

I have scanned the computer for viruses, but no viruses have been found.

The computer also can't browse any intranet or internet website using Google Chrome, Mozilla, or Safari.

I have checked the hosts and lmhosts file and no entries exist.

I have completely uninstalled Internet Explorer 8 have rebooted and then have uninstalled Internet Explorer, rebooted and then reinstalled Internet Explorer. However, the computer still can open any internet or intranet sites.

Furthermore, the DHCP IP address information is correct and no other computers at this site are having any problems.

The computer can do all other network functions, such as sending and receiving email, printing, and browsing to network serve shares.

The computer is running Windows XP SP3.

What do I need to do to fix this?
IT GuyNetwork EngineerAsked:
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A quick way to check for malware - with some repair options is to run "Rogue Killer": (Rogue-Killer-What-a-great-name)

Run all of the menu options and post back the logs that are generated.
is a firewall installed on the computer?
Try Winsock_XP_Fix

Or at the command prompt, run this command:

netsh winsock reset catalog

Or run LSPFix checkmarked "I Know what I'm Doing" box and click "Finish"
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Sounds like something is blocking port 80. Can you open an https site?
Thomas Zucker-ScharffSolution GuideCommented:
It also can't hurt to check your hosts file (windows/system32/drivers/etc/hosts).  It should have only one uncommented entry  Localhost

If you do find a problem there.  I suggest using the file located here in the future
Have you checked the proxy settings on the browser?
(HOSTS file was mentioned in the original post and Proxy is mentioned in the link to my Article http:#a35728746)
To help troubleshooting can you:

1. connect using Firefox or Google Chrome (another browser)?  In other words, is it just IE with the problem?

2. telnet to port 80:  "telnet 80"  (IOW, is it port 80 based rather than browser based?)
IT GuyNetwork EngineerAuthor Commented:
Yes, the hosts file has only the local host entry.

There are no proxy settings.

I have restored internet explorer back to its default settings; however, nothing ever fixes this issue,
Have you tried the suggestions from me or 'rpggamergirl'?

It would really help if you would read the original post and all prior suggestions before posting anything.

The specific site guidelines for this are here:
Are there guidelines for answering questions?
Read previous posts before commenting: It is important to read the entire thread so that you know the current situation. That will keep you from posting a duplicate answer or one that has already been shown not to work. If you basically agree with another comment but have something more to add, remember to give credit for the original suggestion -- mention that Expert by name -- in your post.

have you tried Winsock reset? (not sure what rpggamergirl's link does) at command prompt type...

netsh int ip reset c:\IPreset.log

(the last part is any filename to store results of the reset)
@younghv - A little touchy today aren't we?

@OP - I missed that you tried other browsers when I saw that you had only uninstalled and reinstalled IE.  Sorry about that.  Have you tried the telnet?
Thomas Zucker-ScharffSolution GuideCommented:
In rereading this thread, the suggestion that makes the most sense is Dave4125's.  He asked if port 80 was being blocked.

Try this website:

It will tell you what ports are open on that computer (if you can get to it).

Otherwise use the current open ports tools found here: 

or here 
(note this is seen as a malware tool by most scanners so put it on a cd otherwise your scanner is likely to erase it)
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