I found a easier way to do it
I went in to notepad opened the launch.bat from the Voltz server
java -Xmx3G -Xms1G -jar Voltz.jar nogui
pause
this what it said
java -Xmx1G-Xms1G -jar Voltz.jar nogui
pause
and I changed the 3 (underlined) to a 1 and it worked fine