What can I do if Windows 7 fails to boot after XP crashes in dual system

Q: My computer originally installed Windows XP and Windows 7 dual system. After the XP system crashed, I directly formatted and reinstalled the C drive. As a result, I can't enter Win 7 now. I have an image file of the Windows 7 installation CD in my hard disk. How can I fix it?

A: First of all, to restore Win 7 boot manager. Enter XP and use a virtual drive (such as Daemon Tools) to load the Win 7 CD image file. Enter "cmd" in "Start → Run" and run to open a command prompt window, then enter the following command:

h:
cd boot
bootsect /nt60 SYS

where "h:" is your virtual drive letter. In this way, the boot manager of Win 7 is restored and the XP boot manager is deleted. Next, you need to enter Win 7 to create a boot menu for XP, so that all the operations are completed.

Click "Start → Programs → Accessories", then right-click "Command Prompt" in the attachment and select "Run as administrator", then type the following command to manually create a startup entry for XP:

Bcdedit \\create {ntldr} –d "<Windows XP>"
Bcdedit \\set {ntldr} device partition=c:
Bcdedit \\set {ntldr} path \ tldr
Bcdedit \\displayorder {ntldr} –addlast

Exit the command prompt after all runs. Copy some hidden system files (both in the system root directory) of "Ntldr", "Boot.ini", "NTDetect.com" from the flash memory to other Windows XP systems, and then copy to the native drive C of the machine. Under the root directory of the disk. After the file is copied, right-click "My Computer → Properties → Advanced System Settings", click "Settings" under "Startup and Recovery", you can see an extra "in the default operating system" menu. Earlier versions of Windows." Here you can set the default startup system and set the selection time. After the setup is complete, restart your computer and you will find the familiar XP boot menu has appeared!