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If you mean a page on the internet, then you should check your "hosts" file in
open with Notepad program and see if you have any suspicious entries left by a trojan.
I tried installing Firefox to see if that would work, and it says it cannot find the server
All sites or just one?
If you tried both browsers, it's something else.
First, see if you can ping.
Start->Run, enter cmd, press enter.
In the DOS window type
ping google.com [press ENTER]
You should see four bits of data sent to google.com and a response time. If it says "operation timed out" 4 times, you have a problem connecting that is not related to your browser.
In this case it could be anything from your computer to the ISP.
If you get a ping from the command window OK, the next place I would look is the DNS/proxy settings in the browser.
FF: Tools->options->Advanced->Network->Settings, try the auto settings or direct connection to the Internet. If you have manual settings in there, FF will save them, just gray them out.
IE:Tools->Internet Options->Connections->LAN Settings
Same applies here, connection script, Auto, Auto connection script, or use a proxy. Theoretically everything should be auto, but you may have to fiddle around with these.
at a command prompt (if you get a black screen, not an error then you have no problem connecting on port 80). Also see if you can connect to secure websites (e.g. [addons.mozilla.org...] and websites on non-standard ports (e.g. [lse.umiacs.umd.edu:8080...] which would help to see whether it was particular protocols causing problems, and whether browsers work.
telnet google.com 80
[edited by: Receptional_Andy at 9:24 pm (utc) on June 1, 2008]