Just a memo to remember these handy commands.
Identify where the problem occurs:
ipconfig
ping 8.8.8.8
tracert google.fr
Renew IP address:
ipconfig /release
ipconfig /renew
Flush DNS:
ipconfig /flushdns
Reset network configuration (source):
netsh interface ip reset
netsh i i p
netsh winsock reset
netsh wins r
netsh advfirewall reset
netsh a r