[ubuntu] Error while downloading and installing

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http://ubuntuforums.org – i was try to download Ubuntu 11.04 using Wubi software ...in the middle it start showing error drive missing .. i tried to try again /continue but it wont work .. so i cancel that ... then it completed downloading but it didnt show me start/restart message ..after that when i restarted my laptop then it took some time to boot and after while start showing Gave up waiting time for root devices: -BOOt args(cat/proc/cmdline) -check root delays -check root -missing modules(cat/proc/modules;is/dev) ALERT! /dev/disk/by-vvid/7ecb-2581 does not exit . droping to shell .. I am very first time user (Hardware)