Browser Not Working Or Connecting To Internet (Checklist)
1. If your browser is not working the most frequent reason is that your firewall is blocking the access. Disable your software and hardware (router) firewall temporarily.
2. Another very common reason is that your DNS cache has not been updated with the new information. This can happen and is very normal. In order to fix this you have to flush your DNS settings. In short, open cmd.exe and enter ipconfig /flushdns. Full details: Flush DNS in Windows 7
3. Corrupt Winsock. Oh yea, I’ve been there! This is a mean one, but I wrote a little batch file to repair your winsock:
Download Winsock Fix for Windows 7
4. Make sure you don’t have a proxy enabled for your browser. If a proxy is set up, your connection may fail.
5. Maybe your ISP DNS Server is down. Try to use another DNS server for your DNS lookups. Learn how to set up OpenDNS
6. Your hosts file is missing. Restore missing hosts file
7. Try to do a system restore
8. Try to repair your internet connection with Microsoft’s FixIt tool: Troubleshooting Windows 7
9. The winsockfix might not help, but it might help to set autotuninglevel to highly restricted.
Open an elevated command prompt and enter netsh interface tcp set global autotuninglevel=highlyrestricted Try this as a last resort ONLY. To disable the autotuning for RWIN set it to disabled (autotuninglevel=disabled) .
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