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n7oknFlag for United States of America

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IExplorer cannot see websites with ICMP turned off

I have 4 computers on our network that can't go to websites such as target.com, but can go to bestbuy.com.  Upon further investigation, these PC's can only go to sites that still have ICMP turned on.  I can load Firefox and it works fine, but I really need to get Explorer working as it's the only browser authorized by our company. I reset all security and Explorer parameters to default and even turned off the firewall and tried turning off ALL security options in IE. THe 404 error is what comes up.  There are 50 or so computers on the network, and so far, only four are affected. I've also run spyware and antivirus scans and turned up nothing.  
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war1
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OK well DNS isn't the issue because a ping returns the address. THis would rule out a hosts issue or the PC blocking the site. There are no policies requiring ICMP to work for websites to be viewed.  I played with MTU to no avail. I can telnet to these websites by name using port 80 and get HTML in the session.  They are running IE7 with XPSP3.  No content advisor is running on these machines. We are using a DNS based content filter on the DNS server, and since we can clearly see the website by name in telnet port 80, the problem is not content filter related. It's got to be Internet Explorer. I have not reloaded IE7, but I guess that's the next step unless someone out there has seen this before.
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