Winrar

hello i just joined i have downloaded a few roms. i know i have to extract these using winrar. but everytime i try extracting themi get an error message such as the following
"C:\Documents and Settings\Administrator\Desktop\Games\rebuilt.2623 - Final Fantasy IV (E)(Xenophobia).rar: CRC failed in 2624 - Final Fantasy IV (E)(Xenophobia).nds. The file is corrupt"
"C:\Documents and Settings\Administrator\Desktop\Games\rebuilt.2623 - Final Fantasy IV (E)(Xenophobia).rar: Unexpected end of archive"
Is it something that i am doing wrong? i did download the program from this site. any and all help is welcome thanks

Redownload the file...Check the site on what the file size should be (it say's before the download links) and if it's off by a bit then it become corrupted.I would suggest a download manager to minimise download corruption-doesn't always happen but if you use wireless it's more common.