The ornamental design for computer, as shown and described.
3. Computer
3.1 is a front right side perspective view of the computer of the invention showing my new design and showing the outlines of two computer monitors in broken lines positioned as they would be mounted to the computer, the monitors forming no part of the claimed design but showing the environment for use of the computer of my new design, and showing the knobs on the top of the attachment brackets for the computer monitors in broken lines as the particular shape of such knobs form no part of my new design;
3.2 is a front elevational view thereof;
3.3 is a rear elevational view thereof;
3.4 is a right side elevational view thereof;
3.5 is a left side elevational view thereof;
3.6 is a top plan view thereof; and
3.7 is a bottom plan thereof.
The elements in broken lines in all figures representing the positioning of two computer monitors as they would be attached to the computer of my new design and the broken lines representing the knobs on the top of the attachment brackets for the computer monitors, are for illustrative purposes only, and are not part of the claimed design.