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Hi Karen,
It could be the ethernet driver has been uninstalled/corrupted or disabled in some manner. If you have your motherboard drivers CD, try reinstalling the ethernet driver, as this may fix the problem.
The other thing it could be is a software firewall, which is restricting access to the internet. Equally, if your TCP/IP configuration settings are manually configured, you may have an incorrect IP or DNS address. I'm on Vista not Windows 7, so aren't familiar with it but, if I was a betting man, I'd put my money on one of those being the problem.
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