[R] rJava .jinit() : Cannot create Java virtual machine (-1)

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Hi all,
when using .jinit() I get the message .jinit() : Cannot create Java 
virtual machine (-1).
I set the classpath variable to jre  and to the jdk but nothing works.
 > Sys.getenv("CLASSPATH")
                       CLASSPATH
"C:\\Programme\\Java\\jre6\\bin"
 > Sys.getenv("CLASSPATH")
                       CLASSPATH
"C:\\Programme\\Java\\jdk1.6.0_13"

Java is correct installed because other Java-Applications are running.

I would be nice if someone could help me.

Thanks !