After many tries I finally installed succesfully tortoise with windows7. I've just used the 64bits latest version. Follow the instructions posted by Vastorper (Subversion access explained for dummies) and don't forget to choose the 64 bits version.
I hope that will help.
Bye everybody.
Long Live MECCG!
![Burning Eye [-me_eye-]](./images/smilies/me_eye.png)