We claim the ornamental design for computer wristband, as shown.
FIG. 1 is a top perspective view of a computer wristband showing my new
design; FIG. 2 is a top plan view thereof; FIG. 3 is a front elevational
view thereof; FIG. 4 is a right side elevational view thereof; FIG. 5 is a
left side elevation view thereof; FIG. 6 is a bottom plan view thereof;
and, FIG. 7 is a rear elevation view thereof.