said by Hall:The Network Adapter Repair option will not reset Winsock and there is a good chance the problem is Winsock corruption. With Winsock corruption ping may work but browsing may not. said by XT0RT:
Try these three commands in a command prompt window and then reboot the system, see if it still does it:
1. ipconfig /flushdns
2. netsh int ip reset resetlog.txt
3. netsh winsock reset
Doesn't the "Repair" option in the right-click menu of the network adapter do that ? I did try that already. Besides, as I said, PING works.