These are harmless memory resident parasitic viruses. They hook INT 21h and write themselves to the end of files that are executed or loaded as overlays. "Wizard.268" hits COM-files only, "Wizard.495" hits both COM- and EXE-files. Depending on the system timer they display:
"Wizard.268": I'm WIZARd 3.0
"Wizard.495": I'm WIZARd 4.0
