INT 21 - VIRUS - "QUICKY" - TURN INFECTION ON
	AX = C002h
Return: nothing
Note:	if the virusA program which attaches itself to other programs for the purpose of duplicating itself.	Viruses often (but not always) contain harmful code which is triggered by some event, after a certain number of reproductions, or on a specific date.  See also worm. is already memory resident and infection is disabled,
	  this call re-enables it
SeeAlso: AX=C000h,AX=C001h