The ornamental design for a notebookcomputer, as shown and described.
FIG. 1 is a perspective view of a notebook computer showing our new design in an open state;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is a left side view thereof in a closed state and risen by a stand; and,
FIG. 9 is a bottom view thereof in a closed state and risen by a stand.
The broken line portions of the notebook computer in all views represents unclaimed portions of the claimed design and form no part thereof. The broken line stand in FIGS. 8 and 9 illustrates unclaimed environment and forms no part of the claimed design. The broken showing of the graphical user interface generated by the display panel behind the transparent window in FIG. 9 represents unclaimed portions of the claimed design and forms no part of the claimed design.