Stefan,
The snapcreator exe and the Java exe should be of the same architecture either 32 bit or 64 bit.
If you have a mismatch the snapcreator service won't start.
You can verify the java version by running java -version -- if it is 64 bit you will have an output like below.
java version "1.6.0_18" Java(TM) SE Runtime Environment (build 1.6.0_18-b07) Java HotSpot(TM) 64-Bit Server VM (build 16.0-b13, mixed mode)
On a 32 bit, there will be no reference for the 64 bit Java version.
If your JVM and snapcreator exe are 32 bit and if you still have issues starting the service, please let me know.