what version of wamp are you using now? depending on what version of mysql you currently have, there maybe some problems upgrading mysql.
I am not the author of wamp, so I can tell you exactly what to do to uninstall everything. if you did not install apache or mysql as a service you should be ok deleting the entire wamp folder, then installing the latest version of wamp.
you can also keep your wamp, and upgrade, but you most likely use mysql_upgrade and mysql_fix_privilege_tables to find and fix any problems. I have a few links below for you so you can see for youself and help you out.
just remember, you only need to perform the steps below if you chose to upgrade your version of wamp, not if you are performing a clean install.
mysql_upgrade Check Tables for MySQL Upgrade
[
dev.mysql.com]
mysql_fix_privilege_tables Upgrade MySQL System Tables
[
dev.mysql.com]
Upgrading from MySQL 4.1 to 5.0
[
dev.mysql.com]