Right click on start menu and select search.
Type cmd or command
then select run as administrator
command prompt will open as administrator.
type the below command
make sure SFC<give a space><forward slash>SCANNOW(without spaces)
and then hit enter.
This will initiate the system file checker scan and this will be finished.
Then type the following
netsh winsock reset
and hit enter.
Restart your computer and you can use it.
Please start a chat if you need any assistance.