Can't Win10 computer install dual system?

First, create a Win10 installation disk, as a new Win10 installation disk, Win7 create a new partition method as follows:
1, right-click on the Win7 computer, and then select "Manage", after entering the computer management, we click again “Disk Management", then you will see the interface shown below.

2, next we need to find a partition with a large remaining space, right click on it, select "ldquo; compressed volume" in the pop-up menu, as shown in the following interface.

3. In the pop-up compressed volume dialog box, we need to enter the size of the compressed space. Since the author chose the F disk of 300G capacity, it has already used 20GB, and the remaining 280GB capacity is available. Because it is used to install Win10 system, and Win10 installation disk, it is generally recommended to have more than 40GB capacity, so here is allocated 60GB, which is 60*1024M=61440(M). After inputting the capacity, click on the bottom of the column. ; Compressed & rdquo; can be, as shown below.

Win7 creates Win10 new system disk
About the new Win7 partition size, you can flexibly allocate according to your actual needs.
4, after the above steps are complete, we will see that the hard disk has another partition, as shown below. At this time, this new partition is not available yet, here we need to create a new simple volume. To do this, right click on the new partition and select “New Simple Volume” as shown below:

5, after that, a “New Simple Volume Wizard” will pop up, first we Just click “Next” at the bottom, as shown below.

There is still the next step, click on the next step, you can see the following interface, click on the bottom of the "Complete", as shown below.

6, this completes the Win7 new partition, and can be used normally, we enter my computer, you will see a new hard disk partition, as shown below.



Win7 new disk partition is completed, the new disk will be created for Win10 system installation. The tutorial is introduced to you here, the operation is not difficult, no need to use any hard disk partitioning tools, just use the disk management tool that comes with the WIN7 system.