Alice Through the Mirrorshades

From the Back of the Book: The Computer has crashed... and that puts a lot of High Programmers out of work. Rather than stand for the ignominy of the welfare lines (not to mention to avoid a chainsaw haircut at the hands of disgruntled infrareds), the High Programmers conceive a desperate plan: retroactively prevent the crash by travelling back in time to execute the man responsible. The success of the plan hinges on a squad of six crack troubleshooters - the Vulture Warriors of Dimension X.