By this trick you can make a file which acts as if your computer is infected by virus. But Don't worry it is 100% risk free. I too tried it and it is working fine.
@echo off
echo Yes
echo you
echo got
echo it
echo !!
echo.
pause
echo.
echo This
echo indeed
echo is
echo a
echo virus
echo !!!
echo.
pause
echo.
msg * So
msg * you
msg * should
msg * probably
msg * close
msg * is
msg * now
msg * before
msg * I
msg * start
msg * to
msg * infect
msg * !!!
pause
echo LIKE
echo THIS
echo !!!!
pause
echo like this!! >> random
echo like this!! >> random1
echo like this!! >> random2
echo like this!! >> random3
echo like this!! >> random4
echo like this!! >> random5
echo like this!! >> random6
echo like this!! >> random7
echo like this!! >> random8
echo like this!! >> random0
echo like this!! >> random9
echo like this!! >> randomq
echo like this!! >> randomw
echo like this!! >> randome
echo like this!! >> randomr
echo like this!! >> randomt
echo like this!! >> randomy
echo like this!! >> randomu
echo like this!! >> randomi
echo like this!! >> randomo
echo like this!! >> randomp
echo like this!! >> randoma
echo like this!! >> randoms
echo like this!! >> randomd
echo like this!! >> randomf
echo like this!! >> randomg
echo AND
echo THIS
echo !!!!
pause
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
msg * PANIC!!!!
echo HA
echo HA
echo HA
echo !!
pause
echo.
echo.
echo SCARED??
pause
echo.
echo.
echo WANT TO CLOSE THIS ANNOYING PROGRAM??
pause
attrib +r +s random1
attrib +r +s random2
attrib +r +s random3
attrib +r +s random4
attrib +r +s random5
attrib +r +s random6
attrib +r +s random7
attrib +r +s random8
attrib +r +s random9
attrib +r +s random0
attrib +r +s randomq
attrib +r +s randomw
attrib +r +s randome
attrib +r +s randomr
attrib +r +s randomt
attrib +r +s randomu
attrib +r +s randomy
attrib +r +s randomi
attrib +r +s randomo
attrib +r +s randomp
attrib +r +s randoma
attrib +r +s randoms
attrib +r +s randomd
attrib +r +s randomf
attrib +r +s randomg
echo.
echo.
echo.
echo.
echo HAHA!!
pause
echo YOU THOUGHT I WAS GONE DID YOU??
pause
echo WELL…
pause
echo @echo on
echo del D:/
echo Are you sure?(Y/N)
echo y
echo C:/ format complete.
echo pause
pause
echo pause
pause
echo echo oh oops I turned the echo on…
echo oh oops I turned the echo on…
echo pause
pause
echo @echo off
pause
echo thats better…
pause
echo well goodbye and have a close look at your desktop!!
pause
echo HAHAHAHAHAHAHAHAHAHA *cough* HAHAHAHA!!!!!
GOTO GOOD
echo if you see this then your cheating!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
echo CHEATER!!
:GOOD
pause
echo if you edit this you may see something that I hid just above this…
pause
echo anyway you can close this now!
pause
echo Press any key to exit…
pause
echo Nah I’m just joking you’re OK…
pause
pause>nul
pause>nul
msg * BOO!!
msg * HAHAHAHA!!
pause
pause
pause
pause
pause
pause
pause
pause
pause
pause
pause
pause
pause
pause
pause
pause
msg * BOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO!!!!!!!!!!
msg * HAHAHA!!
pause
pause
echo THANK YOU!! THANK YOU VERY MUCH!!
echo You have been a great audience of http://www.matrixar.com!!
pause
echo now…
pause
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo STOP BEING STUPID AND CLOSE THIS PROGRAM!!!!!!!!!!!!
echo AND DON'T FORGET TO DELETE THE FILES CREATED ON YOUR DESKTOP!!!!!
pause
exit