All right. You also can get it. It is mostly that you should install linux os , such as ubuntu or other linux, after installing windows os firstly. The reason that linux will manage grub boot rather than windows. you know, you should install windows, such as windows 7.
Then, you may met some issues if you use UEFI boot's compute rather than grub boot's compute. I can solved it by these steps. Here is that:
- First, you must close the security boot and fastboot options in bios.
- In terminal, to do sudo add-apt-repository ppa:yannubuntu/boot-repair.
- To do sudo apt-get update
- To do 'sudo apt-get install boot-repair' for installing boot-repair.
- After installed it, you should do sudo boot-repair.
Then, reboot your pc. You can see that the list windows7 UEFI of grub lists in screen.Choose it, and enter. Now, if everything is ok, your windows will can works well.