У вашего броузера проблема в совместимости с HTML5
Few days earlier, I was unable to change proxy settings even I am the Admin of the computer. So, I decided to enable the hidden Administrator Account on my Windows 7 PC.
Sometimes, if by mistake you installed a Malware or Adware giving it Administrator privileges than it can take the control of your Computer. In that case this hidden admin account on your Windows 7 or Windows 8 Operating system can be very useful.
If you're looking for detailed written tutorial than visit:
http://www.spicytweaks.com/2014/08/enable-hidden-secret-administrator-account-windows-7-8-1.html
The above video tutorial will explain enabling hidden administrator account Windows 7 but enabling this account on Windows 8 is also same. Also, read the written tutorial to know many other things and other ways to enable this admin account on your PC.