Wubi initramfs problem !

Not so long back I came to know about the Wubi installer which started getting shipped with Ubuntu Live CD. I wanted to try it some time but never got a chance as I already have Ubuntu installation on a separate partition in my laptop.

Few weeks ago, I got a spare Desktop running Vista and tried the Wubi by installing Ubuntu within Windows partition by allocating 10GB for installation. The installation process was very user friendly and it went smooth and my Ubuntu was running fine for many days, until one day, when I booted onto Ubuntu it gave a strange error and gave me BusyBox initramfs prompt !!

Ooops, I was totally unaware of this and did some googling to find a solution for this, but got none! Yesterday I booted my machine onto the Vista, and saw that it was not shut down properly last time, then I shut it down properly and rebooted onto Ubuntu and to my surprise everything started working back as usual ! ! !