Prior installation, create db account including db, username, and password; create folder phpbb2, or what ever name you like, in c:/wamp/www; then, download and extract the content of phpbb2 package in this phpbb2 folder; after that, just follow the instruction.
If still not sure how to, email TwistedChaos or me:
my username + my domain = my email
However, first thing first, for your own security, you should setup master password after installed wamp, visit my site for setups
Have fun,
[
test.jlbn.net] (Sample Testing Codes for PHP, MySQL, ASP.net, SQL, JSP)
[
www.jlbn.net] (Basic Guide for WAMP & Add-ons)