Si no lo consigues con otro navegador, recuerda desactivar algun Antivirus que esté instalado, durante el proceso.
Si se trata de un problema de red:
If you are using Windows computer make sure that the LAN settings is set to detect setting Automatically .
1)Open Control Panel and then click on the option "Network and Internet" .
2)Click on Internet options, click on 'Connections' tab.
3)In the 'Connections' tab, select 'LAN' settings, you will be able to view the Local area network settings box.
4)Check the box-"Automatically Detect Settings" and then "uncheck" all the other check boxes like 'Use automatic configuration script', 'Use a proxy server' , Bypass proxy server' ,then click on ok button .
6)Click on "LAN settings" button again , make sure "Automatically Detect Settings" is the only option selected, keep the LAN properties window open.