Windows 7 client machine. After a reboot, the Network and Sharing Center->Network Connections folder was empty. The icons for the network adapters (NIC) were missing. The reboot incurred a chkdsk which had found some registry corruption.
Under the registry key:
Make sure the below mentioned values are not missing. If they are missing please add them:
Creat it with a value of "Local Area Connection"
Creat it with a value of "0". Refereced a working machine for this value.
Mostly additional adapters would increment this number.
Creat it with a value of "0x70b".
Disclaimer : Please backup the registry before editing it; in case if anything happens you can restore it back.