Hello Vikram.
there is a electricity problem in there.and server shutdown unexpected. therefore downloads currupt i thing so.
There is only one way to install LUA again.
LUA is very good program but maybe Symantec Employees create new version LUA. And can fix this currupt problem.
@bekir
We haven't Backup Exec :( and I cannot take a image because it is a Exchange server and Database in C:\ drive
And d:\ drive is using by users for files.
That's why I cannot use image programs.