I'm using Firefox browser with a Lenovo IdeaPad W8.1 64bits. I can navigate WWW but there are a website, only one, that I cannot connect with. Other computers using the same network can connect with this website. My computer is a dual boot system. If I start Ubuntu then I can connect also without problems. I have disabled the firewall but the problem is the same. Using IE is not solution. I've tried to reset hosts file according to http://support.microsoft.com/kb/972034
but I cannot change the name "hosts" to "hosts.old" with administrative privileges because I receive a message that the file is opened by WRSVC even if the browser is closed.
I appreciate any suggestions.