also remember

http://localhost/dolphin ( unrar dolphin in www )

when instaling from locally inside your internal ip
use
http://localhost/ ( thats how it shoudl be )
dolphin you take out everything from the rar / zip file and put it into the www folder and make sure you have all your paths rights
make a database name with same user name privaledges make sure to enable all check mark them all in phpmyadmin and make sure you use the database name and user name with password so it will see more corespond or your instaltion wont go threw

for example use dolphin and make same user name as dolphin as name in phpmyadmin with password and check mark all privalges for this user name and save apply