Server 2008 runs very slow when a brower is open

I manage a windows 2008 server (virtual) as a web server but over the past few days it has developed a serious problem. when a browser is open and opening most web pages (but not all) the server virtually locks up; it grinds to a halt and you can't click on anything for about 5 minutes.
It's generally running slower over-all anyway even without a browser open.
It's the same whether IIS is running or not.
There's nothing obvious in the event logs.
Task manager shows very low CPU usage and applications look normal. System memory usage is about 60%
no viruses or spyware

Any suggestions anyone?
51501984Asked:
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51501984Author Commented:
turns out it was some strange problem on a local network. I connected to the server via remote desktop and it was slow, tried it on a different network and it was fine. A week later the problem went away. Server was never at fault.
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kumarnirmalCommented:
What is the browser you are using, if you are using IE then have you tried alternate browsers?
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51501984Author Commented:
it's exactly the same with either IE or Firefox.
It's worked fine for over a month until the last few days.
I've cleared the caches and rebooted.
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