跑跑卡丁車下載問題

跑跑卡丁車下載問題
我在跑跑卡丁車官方下載跑跑卡丁車主程式,
下載完成後,在桌面彈左個公仔右下角有箭嘴個舊野,我KICK個舊野,佢彈左堆文字(所彈的文字)>>>Installer integrity check has failed. Common causes include
incomplete download and damaged media. Contact the
installer's author to obtain a new copy.

More information at:
http://nsis.sf.net/NSIS_Error

點解去這樣?點解決?