I seem to be unable to access certain websites (such as quakelive.com, adobe.com, and tvtropes.org). I am able to access them easily with other machines on my network, and my friends tell me they can also use them, so I know for certain that the problem isn't my network and said websites are not just having downtime. When I try to access the aformentioned sites in Firefox 3, I get the "Page Load Error" message:
Connection Interrupted
The connection to the server was reset while the page was loading.
The network link was interrupted while negotiating a connection. Please try again.
I'm running Windows XP.