When the windows Operating system especially Windows vista  a specified file "BOOTMGR.EXE" Is corrupted or deleted,

the system faces a major error known as Bootmgr.exe is missing and the Operating System could log in and even the safe

mode could not be open. Its a must that we need to format. But instead of formatting I have rectified this error.  By using

"UBUNTU" Linux  Operating System, we could open the files that are on all at windows vista. By Using Ubuntu Operating

System.  We could replace that particular file "BOOTMGR.EXE" at C:\ drive. By this way we could regain our Operating

System, and we can open it normally.