Instructions (adapted by me, from google translator)
WARNING: All I've done is to improve the google translation of this process. I haven't tried it yet, so I can not confirm if it is exactly like this or if something is different.
In theory (based on the poor google traduction), the whole rooting and unlocking process would be like this: you install the drivers first, then you install the superuser and IS03rootsw134 apks, and also enable "phone -> Settings -> application, check the unknown source". Then you run connect the phone to the PC. You run menu.exe, press "YES" two times, press number 2, then temp-root via IS03rootsw134 apk and press any key to continue. It appears something about "busybox" and you press 1 to install it. After that, press any key to continue, then it'll ask you if you want to install superuser; as you already did you press 2 and you'll get bakc to the main menu. Select backup of your machine's documentation to the memory card (the space of your memory card at least 1.5GB).
Unrar "007sh0038.rar". Grab the bootxxxxx.img file that you got by making the backup and rename it to boot.img. Put the "boot.img" file in the same folder as 007sh0038 (so you'll have 007sh0038.exe and boot.img in the same folder). Run 007sh0038.exe and it will generate a new "boot.img" file, and rename the boot.img file you had before to "boot.OLD". You can rename your new generated boot.img file to whatever you like; the creator of the post named it MasterT.img. Move the file to the folder where "menu.exe" is located.
Run menu.exe, and enter YES. It will ask you something about temporary root, press any key to continue. Press 2. In the main menu, press 5 (flash the rom to recovery ) and you'll be asked to write the rom name. The creator of the post named it MasterT.img so he typed MasterT.img
Then press enter, type uppercase YES to confirm execution, and then are you'll be asked to install autoxexc.sh .type "y" to install this, and then a bunch of stuff suggesting that the copy files to / data / local?
Type "y", and a any key to continue to the point that it'll ask you nandunlock? (Y / [N]) He directly enter uppercase N! (I don't really understand WHY of this last step, I mean, he selects "no" to nandunlock, but WE DO want to nandunlock... so... I'm confused). And the device should be rooted.
To check if it is rooted, you should start the device in recovery mode (not sure how to do that, maybe it's like in this tutorial: http://www.youtube.com/watch?v=gIyYHfb1Afg ) and it should say somewhere "ROOT succesful" but I didn't really understand where.