Hi Bruno- >Have anybody had problems using VTK (3.2 or 4.0) under Windows XP? I am building and running (and writing this email) on Windows XP with no problem. Will William J. Schroeder, Ph.D. Kitware, Inc. 469 Clifton Corporate Parkway Clifton Park, NY 12065 will.schroeder at kitware.com 1-518-371-3971 x102 (phone) 1-518-371-3971 (fax)