I did try this guide:
[GUIDE] [SU760] How to ROOT V29C/D ICS
but it didn't work for me...
So I tried the script posted here:
and it worked really well!
* Get version 1.2 of adb_restore_rooting if you can't unpack v1.6 with your current unzipper
* Unpack the archive
* Turn on USB debugging on your phone (Developer options)
* Execute rooting.bat
* Follow the instructions on screen
* When it says "Done!", press return on your PC and it should complete the process.
Note: For those who really want to use v1.6, install 7-zip (http://www.7-zip.com/). Thanks MoYo!