Can anyone help? Unable to extract Rar. files

I just downloaded some ROM for my ds. And when I was about to extract, it states that one of the file is corrupted and the other unexpected end of archive.
Can anyone help to tell me what to do?
Thankyou!

It might have been corrupted.
Try re-downloading it with a download manager.

How do I do it by? Thanks.

About which rom are we talking?

Make sure extract it by using the latest version of WinRAR,
Try download the latest one from here,
-> http://www.rarlab.com/If that does not working,
Redownload it again using download manager such as,
Flashget, Orbit Downloader, or Free Download Manager.
Search for it at here,
-> www.softpedia.com

Replying to #5

Meaby via Filehippo.com is better there are faster BETA versions online.

Thanks alott! ;)

That happens to me when my download is interrupted (like getting disconnected for a few seconds while downloading).Try downloading it again and see if it's okay then : )