If you are ever having a problem with your network adapter or network and you have tried the standard troubleshooting techniques - considering the nuclear option:

• ipconfig /flushdns
• nbtstat -R
• nbtstat -RR
• netsh int reset all
• netsh int ip reset
• netsh winsock reset

Entering these commands (in that order) at the command prompt will completely reset your network card and TCP/IP stack, although you may sometimes need to also reboot.