Littlemiss

Hi, I hope someone will be able to help me. I am very new to Prestashop and I have a new website that has been set up for me so I am now looking to edit my pages how I wish using the web editor. I do not have access to the database or server areas. I have just purchased a new theme v1.0-Baby-Dream.zip and when i try to upload the theme i get this error " An error has occurred during the file upload. ". I have installed the theme module, is there anything else i need to do? Im a bit worried that i wont be able to get it working having spent money to get it! Any help would be greatly appreciated! I am running version 1.4.7.0 if that helps, Thanks, Anna