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Resetting the TCP/IP Stack in Windows
This can fix several types of network access problems.
Typing the following command at a command prompt resets the TCP/IP stack (all the programs that handle/filter packets on their way in or out of network interfaces) in Windows. This can fix a myriad of problems with lack of access to the internet. Warning: this will usually disable third-party firewalls. To fix them usually you have to reinstall.
netsh winsock reset
