Windows

Use editor to open the hosts file in the path of C:\Windows\System32\drivers\etc.Copy the hosts file content to C:\Windows\System32\drivers\etc.Finally,save it.
Notification：If you can't save it,you should edit the user permissions and check the 'Write' selection.
If operations above are 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.Finally,save it.

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