Here's a few things to check before you try again:

1. On your Windows system, open a Command window (the old-style DOS prompt). In that window, type the command

java -version

(Note that the hyphen "-" is required as part of the "-version" option to the "java" command)

This will verify that the Java runtime (a prerequisite for YAAC) is installed properly and print out what version of the runtime you are using. If this command does not work, then you need to fix your Java runtime installation before you go any further with YAAC.

2. Assuming you passed the Java runtime test, and still using the Command window, cd into the directory where you unzipped the YAAC.zip file. Issue the DIR command and verify that the YAAC.jar and YAACMain.jar files are present in that directory, and there is a subdirectory named images.

3. Assuming all the above-mentioned files are there, type the command

java -jar YAAC.jar

This will start up the Java runtime running the program inside the YAAC.jar file. Do not discard what gets printed out after you run this command; if the YAAC map window does not open and prompt you to run the configuration wizard, then the text printed in the Command window will be critical to determining why YAAC didn't start up.

Hope this helps.

Andrew, KA2DDO

author of YAAC