Virus.DOS.Acvt.1243 or Acvt is a virus that runs on MS-DOS.
Acvt is a dangerous memory resident parasitic virus. It hooks INT 21h and writes itself at the end of .COM-files that are executed or loaded as overlays. It contains code which is not used. Infected files contain the counter that is decreased on every infection attempt of this file. On the 100th attempt the virus erases some system information on hard drive. The virus contains the internal text strings:
acvt no $yes$*.* $%COMEXEDBF