Windows

Use editor to open the hosts file in the path of C:\Windows\System32\drivers\etc,and copy the content in hosts to C:\Windows\System32\drivers\etc,then save it.
Notification：If you can not save it,you should edit the user permissions and check the 'Write' selection.
If the above operation is difficult for you,don't worry!You can download the automatic hosts configuration tool.
Download:http://pan.baidu.com/s/1bnrPn1l

GNU/Linux

For example,you need to open the terminal on Ubuntu and type gksudo gedit /etc/hosts,and you can copy the content in hosts to C:\Windows\System32\drivers\etc,then save it.

Automatic hosts configuration tool was developed by c++,it based on QtGui and abided by GPL license.
If I have no time to update this project,you can visit follow links to get the newest hosts file
oschina | Acrylated
If you can not visit google when replaced the hosts file,try to use this software GoGo Tester to search an available google ip.