Tried rebooting both the laptop and router?
Power cycling the home network equipment would be my guess also.
At the command prompt, run the following commands in the listed order, and then check to see if that fixes your connection problem:
Type netsh winsock reset and press Enter.
Type netsh int ip reset and press Enter.
Type ipconfig /release and press Enter.
Type ipconfig /renew and press Enter.
Type ipconfig /flushdns and press Enter.
Multiple times. Its looking more and more like the laptop just doesn’t like my old router. Like I said the netbook, which was also Win7, talked to the router OK.