Connection problems after installing wireless router: frequent "Server not found"

I recently got a Linksys wireless router but since then, a lot of webpages show "server not found" frequently. I can eventually open these if I keep refreshing the page or come back to it later. This only happens to my desktop PC connected by a cable but never happens to our 3 laptops with wireless connection. The LAN cable changed but problem persists. Desktop PC swapped but problem still persists. Is this simply a defective router?

What is the model no of the router...?
Try changing the MTU size to 1350 on the router and power cycle the router and check..

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Check the address for typing errors such as
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The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information.
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Regularly get "Server Not Found" then always works with a retry. Why

Regularly get Server Not Found" then always works with a "retry".
== This happened ==
Every time Firefox opened
== I started using Firefox

Issue
I have another kind of problem with Firefox
Description
Regularly get Server Not Found" then always works with a "retry".
This happened
Every time Firefox opened
I started using Firefox
Firefox version
3.6.3
Operating system
xp windoes
User Agent

Connection problems after installing wireless router: frequent "Server not found"

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