Whenever i download files, many times it stops before downloading completely and i have to restart the process by visiting the site.

Whenever i download files, many times it stops before downloading completely and i have to restart the process by visiting the site. Suppose the file is 20 mbs, but it downloads only 2-3 mbs, reports that download is complete, but its just a part of that.

It is possible that your anti-virus software is corrupting the downloaded files or otherwise interfering with downloading files by Firefox.
Try to disable the real-time (live) scanning of files in your anti-virus software temporarily to see if that makes downloading work.
See "Disable virus scanning in Firefox preferences - Windows"
* http://kb.mozillazine.org/Unable_to_save_or_download_files

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