Hi,
I noticed someone have this problem, so it's a guide:
1. Install Git-1.6.0.2-preview20080923.exe from http://code.google.com/p/msysgit/downloads/list
2.In the installer select the ssh option
3. Now launch the GIT bash from Start -> All programs -> GIT -> GIT Bash
4. Type the following command
$ git clone [url]git://github.com/mangos/mangos.git[/url] mangos
* You don't need to type the "$", it's alredy there
5. When the process ends, you will find the MaNGOS sources @ C:\\Users\\$YourUserName\\mangos (Vista) or @ C:\\Documents and Settings\\$YourUserName\\mangos (XP)
I hope this can help you, greetings, Majere