What are those red colour file names???
 

When i check my library under incomplete files, i always see file names highlighted in red colour font. What is the meaning of this red colour? is it mean that the file is no longer downladable because my host moved the files away from the share folder?

it means that the file is currently not being shared because it has either nothing in it, or none of the pieces of the file have been verified to share. you really shouldnt need to worry about this since limewire takes care of this automatically.