What can I do if the hosts file in win7 cannot be saved?

hosts file can not be saved Method 1:
Close 360 ​​anti-virus software, and then modify, it will not appear can not be saved. For example, 360 has some kind of security software protection measures, it will automatically restore the hosts file to the default state, so the hosts file will not be saved.
hosts file can not be saved Method 2:
Right click on the hosts file, select Properties -> Security -> Edit, set the user user to full control.
hosts file can not be saved Method three:
Copy the hosts file to the desktop (or the rest of the path), then edit and save, then copy the modified hosts file to the original path and replace the original hosts file. The system will prompt for administrator rights to continue, just follow the prompts and click to continue to replace the original hosts file.
hosts file can not be saved Method four:
As an administrator, click Start & mdash; & mdash; Run, type: cmd, then enter notepad c: windowssystem32driversetchosts, press Enter to open the hosts file in Notepad mode At this time, you can edit and save directly.