My website totally not working

[jinklesun56]

I created the website some days ago and installed Boonex dolphin 7 from softaculous.Before that itwas showing some default page error or something.After installing it i got some errors at the adminstration panel and also at the website.In 1 day I was unable to access the modules It showed 404 not found error on only the modules.Now when i try to access it It is showing 500 Internal Server Error.I'm going nuts.I have deleted and recreated the thing 3 times.This is the third time this stops working.Please help me.I've tried to fix it with all I've got Still nothing.Also tried to chmod the file Nothing worked.I need help desperately Please
Website URL:http://galfa.co.cc/