This sounds like a problem with your antivirus (AVG in this case).
Can only suggest that the best thing to do is uninstall the AV program and then do a reinstall.
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Having said that. I think that it was the AV program that was causing problems with you disabling your network connection.
http://www.cableforum.co.uk/board/sh...ad.php?t=31374
But as you never told me if you had one or not, or answered any of the other questions I asked you, it was impossible to help you sort it out.