The ornamental design for a notebookcomputer, as shown and described.
FIG. 1 is a perspective view of a notebook computer showing our new design;
FIG. 2 is an another perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a top view thereof;
FIG. 8 is a bottom view thereof;
FIG. 9 is an enlarged view of an indicated portion of FIG. 1; and,
FIG. 10 is an enlarged view of an indicated portion of FIG. 2.
The broken line showing of portions of the notebook computer is for the purpose of illustrating unclaimed portions of the notebook computer and forms no part of the claimed design.