I want to convert PDF file into doc. whn i copy - pest some sentences, some table or box appear in the microsoft works word. i want to remove that box. how to remove??

Download this program from here...
http://hifkool.blogspot.com/2011/02/able2extract-pdf-to-word-excel.html

I've ever tried a pdf converter tool to convert pdf to image. May have a look:
Convert PDF to Image Types in NET pqScan com
How to Convert PDF to JPEG JPG

Yes it can.. just download PDF to Word Converter.. it can convert Docx, doc files. Or you can simply convert it using the internet.it can convert all types of pdf to ms word document. Additionally, the output word is an editable word, you can make another editing on this converted word document.and all the content and font will keep the original format and style, all the images in the pdf will keep the original size and location in the converted word document.
more- https://www.stillbonsoftware.com/pdf-to-word/

If a user wants to convert a password-protected PDF file to a Word document file, then Kernel for PDF to Word Conversion software is the best option to be chosen requiring that the password must be known to the user. The software is an easy-to-use and efficient PDF to Word convertor that preserves the data structure, formatting and data properties of the content of the PDF files while conversion. The user can include/exclude graphics, can define the page ranges while creating the Word .doc files and can impose encryption and local restrictions on the newly-created PDF file.

Why not just try the free Nemo PDF to word? It could absolutely retain the full original formatting.

I know several website can provide you cool function of pdf converter which help you convert pdf to word.
Have a try and good luck.
http://pdfconverter.formacos.net/
www.pdfconverterpro.com
http://www.dvd-creators.net/pdf-converter/

I think you need Advanced PDF Converter as it is very good at preserving the formatting, with text content, page layouts, images,and text hyperlinks preserved.It also allow us to convert a lot pdf files to word format at the same time. I am now using it.

In fact, you can try AnyBizSoft PDF to Word Converter, which is free on facebook.
It preserves the original text content, images, layouts and hyperlinks after conversion, efficient and accurate. You can also batch convert up to 200 PDF files at a time.

Here is the link to AnyBizSoft PDF to Word Converter:
http://www.anypdftools.com/pdf-to-word.html

Tenorshare PDF Converter is a 5-in-1 PDF utility which helps you batch or partial convert PDF files to editable Words, or converts Word documents, PowerPoint presentations, Excel Spreadsheets to PDF files at one time.