problem in unzip

hi guys
im downloaded Personal Trainer: Cooking ds rom twice.
both times,when i was trying to unzip this winrar said the file is corrupt.(i have this problem with some other games too)
man i want to play this game....what should i do?

Re-download the file using a download manager

Use either Either Flashget, Orbit Downloader, or Free Download Manager when you download it.
search for it at here, www.softpedia.com