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There could be a ton of reasons for this.
- (your own) Proxy server not doing what it's supposed to.
- Browser Hijack - in a dos box (run "cmd"), can you ping those sites ("ping www.ebay.com")?
- Internet explorer's security settings
- firewall being too restrictive.
What do you see when you want to go to one of these sites? For example, when trying windows update, do you see a "page not found", or are you unable to find/download updates once on the page?
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