Operating system notfound is always prompted when the system is restarted after it is installed! There may be two reasons for this:
First, use vmware to install the system without setting the disk as a function. So the system is not started!
Second, the first partition is not activated after the disk partition. You can use the "dostoolset" to solve the problem:
First, make sure that there is a "dostoolset" option in your installation disk. For example, the "Deep deepin" is the "Deep deepinDOS toolset '. Select the option to go to the tool set. After entering, a cursor blinks and waits for the command to be entered, and a command prompt is displayed.
Enter the partition table management command DISKGEN (different system disks may be different) to go to the Management page.
In the pop-up window, select your drive C, click partition in the menu bar -- activate (F7), then hard disk -- save disk, and then hard disk -- exit.