Insert the windows system CD, boot from the CD, and perform the repair according to the following command:
After the CD is booted, choose to repair the system and choose "command prompt"
1. Enter bootrec /fixmbr | Repair MBR
2. Enter bootrec /fixboot to repair the system boot sector
3. Enter bootrec /scanos to repair bootmgr
4. bootrec /rebuildbcd rebuild bcd
5. Bootsect.exe /nt60 all /force Rebuild the boot sector