In the use of computers in order to optimize the startup speed of XP will often use a number of modified software, these software without exception will modify your registry, and even modify to the dual system user's system startup files, resulting in dual-system boot file boot.ini lost. When the Boot.ini is lost we have to build another boot.ini to restore the system to boot.
The boot.ini is a system file that needs to be queried when the system starts, which tells the startup program how many operating systems the computer has and where the system is located. The recovery method is as follows: Click the Start menu, point to program → attachment → Notepad, open notepad, and enter in Notepad:
[boot loader]
timeout=10
Default=multi (0) disk (0) rdisk (0) partition (2) WINDOWS
[Operating Systems]
multi (0) disk (0) rdisk (0) partition (1) windows= "Microsoft WINDOWS"/fastdetect/noexecute=optin
multi (0) disk (0) rdisk (0) partition (2) winnt= "Microsoft Windows XP"/fastdetect
Then save it as a file with the name Boot.ini, and store the file in the root directory of C disk.