Make sure that you are installing the Java Runtime Environment. I got mine from java.com/download/ie_manual.jsp
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After it is installed go to the command prompt and type java -version
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If it installed correctly you should get a message listing the version number and identifing itself as the Java SE Runtime Environment.
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Now you should be able run YAAC through the GUI by clicking on YAAC.jar or if you are comfortable with a command line you can run it from it's home directory with the command java -jar YAAC.jar
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Make sure that you are in the YAAC directory and that you aren't accidentally inside of the .zip file. This is such an easy mistake to make on windows that I usually delete .zip files or move them to a USB drive after unzipping the contents.
