Network up but having problems reaching web sites

I first suspected this to be a hardware problem but now I'm beginning to think it could be software related.
My problem is that the network connection is up but the browser occasionally says it can't find the server I'm trying to access. I can't really reproduce to problem, since, from what I can tell, its behaviour is completely random.
Sometimes I can use my PC for hours and not have a single occasion of this. Sometimes it may occur every time I try to reach a new server. Eventually I always get where I need to. The problem is that I have to press reload / F5 from one to ten times before this happens.
Where could I start looking what happens at the moment of server not being found?

Thanks for your answers. I'll give OpenDNS a try.
This PC is connected with a wire to a router which in turn is connected to a cable modem. I can always acces the router and the cable modem web interfaces (haven't tried ping but I suppose then it would work too?). Even if the browser says it can't find any remote server I can access my router by entering its IP on the browser's address field.
On the other hand a (Windows 7) laptop connected wirelessly to the same router doesn't seem to have the "server not found" problem.

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Phil "
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thanks before
best regard
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Question
i have used fire fox for a long time but have nothing but problems loading web sites..i think the time has come to uninstall firefox and go with internet explore..im tired of wasting my time trying to load web pages.

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Post back

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"Clear the Cache": Tools > Options > Advanced > Network > Offline Storage (Cache): "Clear Now"
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Network up but having problems reaching web sites

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