Problem with space creating the JVM

Hi everyone!
I have a problem when starting the biserver with start-pentaho.bat. When I try to execute it, it says something like:

Error occurred during initialization of VM
Could not reserve enough space for object heap
Could not create the Java virtual machine.

I searched on the Internet and tried two things but none of them are working for me.

1. I start the server from "/tomcat/bin startup.bat". In this case, the server starts and I can access the locaklhost:8080/pentaho. But it goes really slow and when I want to save something I get an error and in the tomcat server it is possible to read something regarding the space problem. I tried to set the "initial memory pool" and "maximum memory pool" to higher numbers but still it does not work.

2. I start the service with "/biserver-ce start-pentaho.bat" changing before the


But still I get an error with that.

Anyone can give me a hint?
Thanks in advance and kind regards,
Alain