Tente isso, supondo que haja apenas uma instância de programname.exe permitida no sistema:
@echo off
color a
echo ProHaxor1337 Initialised
color b
:start
start programname.exe
REM Delay using ping to localhost (1 ping per second)
ping 127.0.0.1 -n 60 > nul
REM Kill the process forcefully.
taskkill /im programname.exe /f
GOTO start