Karl F. Larsen wrote in a message to Mike Bilow:
KFL> I have a 1987 XT laptop with dos 5.0 on the giant 40 meg
KFL> hard drive. The screen is a bit bleary but when I tried to
KFL> run the virus it locked up the computer. watching with care
KFL> it looks like it is trying to do something to the screen but
KFL> it's not sure what.
KFL> Perhaps you must have at least a 386 or better with svga
KFL> to enjoy this virus.
HAPPY99.EXE should display the message "This program must be run under Win32"
on a DOS computer. It is a Win32 PE-format executable binary and cannot infect
DOS, Windows 3.1, OS/2, or Linux systems. It will infect Windows 95 and
Windows 98 systems. It can infect Windows NT systems if it is run by a user
who has necessary permissions to modify network DLLs and the registry.
-- Mike