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This article mainly introduces the pre-installed windows10 computer how to reinstall windows7, the article introduces in great detail, has a certain reference value, interested friends must read it!

1. Modify BIOS

Press the power button to power on, quickly press [Enter], press lift, press repeatedly until you enter bios mode (enter BIOS at startup which key is different for different models of computers, ThinkPad X250 is the enter key)

two

Enter Security- "Secure Boot and change it to Disabled."

three

Enter the Startup- "Boot and move the USB HDD up to the first place

four

Enter the Startup- "UEFI/Legacy Boot option"

(1) the UEFI/Legacy Boot option is selected as Both

(2) UEFI/Legacy Boot Priority is selected as UEFI First

five

Press F10, save and exit, restart the computer and enter the system installation interface.

2. If the following problems arise:

[UEFI] installed successfully. Prompt Image failed to verify with * Access* after reboot.

First enter Win8, restart, press Fn+F2 to enter the UEFI setup program, find Secure Boot on the Security page, and set it to disable Disabled.

I have a U410 that can be turned off and started safely, and I think the U310 may also support this.

Operation method

1. Click F1 to enter BIOS when Logo appears on boot.

two。 Select Restart-OS Optimized Defaults and change it to Disabled

3.

To establish a GPT partition using the diskpart tool:

1. Convert MBR disk to GPT disk

In the select partition interface, press SHIFT+F10 to bring up the command prompt

Type in

Diskpart

Open the diskpart tool

★ Select destination disk

List disk- lists the disks owned by the system

Select disk 0-Select disk 0. Please determine your target disk according to the disk size.

★ clears the target disk and converts it to GPT format

Clean- erases the disk, which erases all data on the disk

Convert gpt- converts the disk to GPT format

List partition- lists the partitions on the disk because we just converted to GPT format, so the partition is empty

★ establishes EFI partition and system installation partition

Create partition efi size=100- establishes an EFI partition with a size of 100m. If you plan to use this partition to boot the MAC system, it is recommended that the size be above 200m.

Create partition msr size=128- establishes MSR partition. If Microsoft sets up partition by default, the size is 128m.

Create partition primary size=50000- establishes a primary partition with a size of 50000m. Please adjust it according to your own needs. This partition is used to install win7.

List partition-- lists partitions on disk

PS: in fact, a diskpart tool can almost replace other third-party disk tools, such as the famous DiskGenius, can not change the GPT format disk partition ID, but diskpart can.

PS: when you install the MAC system, you need to change the partition ID.

PS: for more information about the use of diskpart, you can type help in diskpart to view it.

2. Complete the installation

In the windows installer select partition interface, click "Refresh", will list the above-mentioned partitions, select the appropriate partition, and complete the installation.

The above is all the contents of the article "how to reinstall windows7 on pre-installed windows10 computers". Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

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