I hope you did perform a full backup before upgrading; anyway, try to uninstall, delete wamp folder, clean wampapache and wampmsyql in registry, then reinstall wamp
Have fun,
[
test.jlbn.net] (Sample Testing Codes for PHP, MySQL, ASP.net, SQL, JSP)
[
www.jlbn.net] (Basic Guide for WAMP & Add-ons)