Lenovo S4 10 pre-installed Win8. 1 installed Win7 can't start.

It is completely possible to modify win7 system from win8 system, but it is a bit troublesome. Because UEFI/GPT currently only supports 64-bit system startup and installation! Win7 x64 installed under UEFI/GPT cannot be activated by ordinary soft activation, and can only be activated by brushing BIOS or genuine activation code! Theoretically, it is not recommended to use GPT partition for hard disks below 2T! Therefore, it is necessary to partition the hard disk of the machine pre-installed with win8 system to modify win7, and the partition type is MBR. Then enter the BIOS, select the security menu, select the security boot, and turn off the security boot after entering. (Otherwise, you can't start the USB flash drive), then select the startup menu, change UEFI/LEGACY BOOT to Both or LEGACY after entering (meaning UEFI mode is not changed to traditional cmos mode, LEGACY means traditional), and then successfully install win7 system with a compatible system disk.

In addition: reinstall the system. U disk or hard disk can be used, and the installation speed is very fast. But the key is to have a system disk that is compatible (compatible with ide, achi and Raid mode installation) and can be automatically and permanently activated, and can automatically install the machine hardware driver sequence, so that the system can be automatically and smoothly reinstalled in the whole process. The method is as follows:

1, U disk installation: download a verified system installation disk file (ISO file), make a startup U disk for installing the system with ultraiso software, start the machine with this prepared system U disk, and then the system can be installed smoothly;

2. Hard disk installation: The premise is that you need a Windows system that can run normally, and select "*". GHO and installation system. EXE "from the downloaded ISO file to the non-system partition of the computer, and then run" Install System ". EXE ",press enter directly to confirm the recovery operation, and confirm the automatic installation operation again. (Pay attention to backup the important data of disk C before execution! );

3. Graphic tutorial: How can I give you a detailed graphic installation tutorial in this respect? Can't attach. Will be judged illegal by the system. The address is in .................................................................................! Hope to adopt!