kernel panic - not syncing - VFS: unable to mount root fs on unknown block

Problem:
I got the above error message when I tried to boot into ubuntu(wubi version, installed inside windows).

Solution:
Replace the file wubildr on c:\ should fix this issue.

click the link below to download wubildr:
https://docs.google.com/uc?id=0B3qkFTf1TQCSZDIzMWRlM2UtOWNiMC00YWE5LTkxYWUtNGU1NThmNzEwOGJk&export=download&hl=en