I am frequently using XAMPP's phpmyadmin for MYSQL database.
I want to install original Mysql database from their developer's site(http://www.mysql.com).
I am very confused that I found 6 types softwares.
Which one should I install?
I also need to access the software using GUI..

Any body can help me?

Which 6 types are you refering to ? The ones in the left navigation ? If you are on Windows then I suggest the MySql Installer. Should contain everything you need.

I installed mysql-5.5.8-win32.How can I access it?Didn't find any GUI.

Download and install the workbench. If you installed mysql server only, then you only have command line tools available.