You have a few choices:
1. Clear the password field in the SQL table directly using an SQL client: "UPDATE PERSON SET PASSWORD='' WHERE Alias='SysAdmin'". The password is stored as a one-way hash so you cannot set a new password in this manner. When you try logging in, use SysAdmin and no password.
2. Delete the PERSON table (from the filesystem c:\mysql\data\puakma\person.*) and re-run the setupdb.bat file.
3. Delete the entire Puakma database from the filesystem and rerun setupDB.bat
Note: To delete the database tables directly, you need to stop the mySQL server.