ruler wrote: ok thanks for that. i have already deleted the MOD folder in phpbb/admin/mods and i havent used the install yet. hope i havent goofed this up thanks again
That's not a problem. Just get the 2.0.21 upgrade mod again and copy the install folder from it so that the install folder appears directly under your phpbb2 folder (the folder structure needs to be phpbb2/install/update_to_latest.php, but obviously if you have renamed your phpbb2 root folder to something other than phpbb2 you should use whatever your root phpbb2 name is).
When you run update_to_latest.php the way I told you, all it does is to update ypur database for 2.0.21 (which has nothing to do with the files you already modified)...so everything should work smoothly.