Avoid spaces in the path of Java and JBoss, that might end in a fuzzy behaviour.
Copy or install Java to a path without ' ' and set JAVA_HOME in your environment or the run.conf.bat
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The missing class should be in d:\jboss-5.1.0.GA\lib\jboss-bootstrap.jar. Please make sure that file exists.
You could try downloading an installing JBoss AS again. By the way, how did you unzip the zip file? Sometimes, if you open the zip file, select the files, and then extract the selected files, not everything gets extracted. It is usually better to right-click the zip file and choose extract.
If that doesn't work, add the option "-verbose:class" to the JAVA_OPTS in run.conf.bat and try again. This option prints out each class loaded and the JAR file it came from. That might gives us some clues.
Downloading the AS again and running helped. Thanks for your suggestions