try this! I encountered this problem few days ago.
Start > All Programs > Accessories and right click on "Command Prompt", select "Run as Administrator" to open a command prompt. In the command prompt window that opens, type type the following commands, each followed by the Enter key:
Reset WINSOCK entries to installation defaults: netsh winsock reset catalog
Reset IPv4 TCP/IP stack to installation defaults. netsh int ipv4 reset reset.log
Reset IPv6 TCP/IP stack to installation defaults. netsh int ipv6 reset reset.log
please update me if you work on this steps!