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.