Install breakage on Windows XP

Hi folks, Mainly just for playing around, I installed xwiki on my Windows XP desktop. I'm using the SDK 1.4.2_10, MySQL 5, and the latest release of xwiki ( 0.9.840). Oh, and Tomcat v. 4.1. Got the database goin OK, and Tomcat, and put xwiki in the webapps dir., but when I try to browse to, e.g., http://localhost:8080/xwiki/bin/view/WebHome, I get a very long error (included after my signature), the crux of which seems to be "Could not execute JDBC batch update". Per the suggestion on the install page, I have tried moving the jta.jar file either into .../webapps/xwiki/WEB-INF/lib or into .../common/lib (the main Tomcat library directory). If I move xwiki's jta.jar into Tomcat's, I simply get connection refused errors. If I move Tomcat's jta.jar into xwiki's, every URL shows up as unavailable. Any clues what the problem might be? --JB