system
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It seems that PC Tools firewall was the culprit. Doesn’t surprise me really, I’ve had other problems in the past with programs conlicting with it.
I have now uninstalled PC Tools and upgraded Avast! to version 6.01000 and everything is now working like a dream
I will stick with Windows Firewall for the time being while I ponder other options.
Thanks very much street_lethal and craigb, much appreciated 