Every operation with Mevenide plugin fails with a

After installing Mevenide plugin i'm unable to use it: every operation i do fire an error (you can see two images i've attached); this occurs only under Windows Vista, not under Windows XP SP2 with the same configuration. I alredy tried to execute Eclipse with Administrator privilege, disabling themes, assigning maximum privilege to current user (although my current user is already an administrator user).
I've read many issues in your bug list, but i've found nothing about this matter.
Do you have some suggestion in order to manage this strange behaviour ? Please help me...and, obviously, many thanks in advance for any suggestion.