How can I reset my Network Card to the default?

How can I reset my Network Card to the default?   I suspect I have a virus, (antivirus software has been unable to decect or remove).  What happeneds is that my iMac keeps getting pointed to a proxy.  I remove it and with in a day it returns.  I only have access to a few sites when under the proxy setting.  I want to LOCK DOWN my network settings.  When I manually set everything back to default my machine works like new... but within a day or so it will be back to being jacked up.
2nd question :  Anyone have a sugestion on a good anti virus with my case in mind???  (im using iAntivirus and I think it is useless)
Dr. N

I'm a bit unclear on what you're seeing, but it's undoubtedly a problem with your network itself. There is no known Mac malware that behaves anything close to what you're describing, so anti-virus software is not going to do you any good. (And you're right that iAntivirus is useless.)
If you're seeing redirects or similar behavior in your web browser, see Eliminating browser redirects and advertisements.
If that's not it, please try to describe in detail the behavior you're seeing.

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