All began when i noticed that PostgreSQL folder takes so much HDD space i decided to uninstall it and the reinstall on otder partition where i had more space (my windows particion was running very low).
After uninstalling i noticed not all files were removed so i removed them manually(2gb Oo).
When i started installing postgreSQL began all the problems, i cant finish instalation because i dont know my account password and when i try to make new acc it says there already exists one accout.
Now i cant use my pt3 anymore and dont know how to fix it -.-
(im using win xp sp2)

Follow the steps of this tutorial and it will walk you through what you need to do in order to get PostgreSQL back up and running again.