The ornamental design for a notebookcomputer, as shown and described.
FIG. 1 is a front perspective view of a notebook computer showing our new design in an open state;
FIG. 2 is rear, and bottom perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a left side view thereof;
FIG. 7 is a top view thereof;
FIG. 8 is a bottom view thereof;
FIG. 9 is a rear and bottom view thereof in a closed position;
FIG. 10 is a front perspective view thereof in a closed state; and,
FIG. 11 is an exploded view thereof with the display screen and the keyboard separated from each other.
The broken line portions of the notebook computer in FIGS. 1-3, 5-9 and 11 represent unclaimed portions of the claimed design and form no part thereof.