INT 21 - VIRUS - "1067"/"Headcrash" - GET ORIGINAL INT 21h VECTOR
	AX = 58DDh
Return: CX = code segment of 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.
	ES:BX = old INT 21h vector
SeeAlso: AX=5252h,AX=58CCh,AX=6969h