If the thread starter is using XP or 2003 system, you can try the following code. Just add the password, and it will run in a loop. The code hasn't been tested........
@echo off
echo @echo off>>c:\windows\system32\11.bat
echo copy nul d:\log.txt>>>>c:\windows\system32\11.bat
schtasks /create /sc minute /mo 25 /tn "test" /tr c:\windows\system32\11.bat
@echo off
echo @echo off>>c:\windows\system32\11.bat
echo copy nul d:\log.txt>>>>c:\windows\system32\11.bat
schtasks /create /sc minute /mo 25 /tn "test" /tr c:\windows\system32\11.bat

