Hi,
I have fixed the problem. You are right, i dont have to create the environment variable AS_ADMIN_USER like the Quick Start Guide says. I install the V2.1
First when you use ant to install the server, it ask that the variable JAVA_HOME points to a jdk install directory; when the instalation is done i had to change the JAVA_HOME value and points to a jre dir.
In the java options in control panel, you make sure that the version of java that is selected for the system is the same that you JAVA_HOME value, and the iexplorer - tools - internet options make suer that the java option is selected too.
After that, i reinstall it and everything works well and i can login to the admin console with the default admin credentials.
Thanx you for your support.
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