Dual-boot for linux and windows

Linux and windows dual-start-general Linux technology-Linux technology and application information. The following is a detailed description. I recently installed linux on my laptop. I used a Ubuntu CD. To be able to use windows at the same time, set it to a dual-boot type. I divided the hard disk into six partitions, and the last one is linux, with the drive letter sda7. I plan to use ntldr to guide linux, so grub is installed in the linux Root partition, that is, sda7. then I restart, I was going to use the boot CD to boot linux. In the result, there was no such option, and there was no way to go to windows. I can see on the Internet that to use ntldr to guide linux, you need to save the content of the first sector of the linux partition as a file and then save it to the C root directory. Because you cannot access linux, you cannot use commands to copy the sector. In windows, I used winhex to open the disk, copied the content of the first sector of the linux partition, and saved it to linux on drive C. in the boot file, and then modify the boot. ini, set C: \ linux. boot = linux boot is added to the end, but when I restart, the "linux boot" option is added to the boot menu, but an error occurs when I select to enter the menu, hal cannot be found in windows. dll files cannot be started in windows. Please help me to see what is going on. Thank you.