The PC is inspiron Dell 9400 Dual Core 1,66 ghz with 2 Go of RAM Windows Vista. The diagnosis of performances of Vista points out to to me that everything is at the top. And even when I deactivate all processes in kickoff problem does not improve ! Moreover with a heavy scritpt of photoshop, the performances of the PC with Vista are wholly correct, and distinctly better than with Pentim IV 3 ghz Windows XP, what makes me think that the shape of the PC is not at issue.