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Can anyone help me or suggest some software that might help me in diagnosing the following fault?

Our dev server is running slow when doing anything over the network, it seems to be connecting it spurts and bursts.

When running a speed test it flat-lines for around ten seconds before it gives a couple of bursts and then levels out for the rest of the test.

This makes connecting with it a real pain from anywhere out with the office.

Also google can no longer be opened or pinged, all browsers, firewall and antivirus turned off.

This problem does not occur when running in safe mode with networking.

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Update/replace NIC firmware and drivers? –  HopelessN00b Aug 17 '12 at 11:16
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Run Wireshark on the server and see exactly what is going on? –  boburob Aug 17 '12 at 11:56
    
Run Perfmon on the server and see exactly what is going on? –  joeqwerty Aug 17 '12 at 13:13
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