Me again....

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I am having silly internet connection problems:
My computer sends out more packets than it receives. As a result, sites load very slowly in the beginning and after a while they do not load at all. I then have to re-boot my NTL box and I get some connection and repeat until you throw the machine out of the window...GRRR
I have checked the settings, but I fear I am missing something.
Can you help? Please.