A HP G61-110SA Laptop/notebook with Windows 7 Home Premium would lose its Wifi connection after windows update. Carrying out a system restore just repeated the problem.
Running Network troubleshooter on the adapter problem produced this result;
‘Windows couldn’t automatically bind the IP protocol stack to the network adapter’
This proved to be an AVG Firewall Module issue, disabling the AVG item in the Network Adapter Properties resolved the issue.