作業系統：Windows 7專業版
Service Pack：Service Pack 1
發生問題頻率：
是否有做Windows Update：有
問題內容：電腦自動升級為Win10，後來還原為Win7就變成盜版，
想重灌變回正版，但是卻找不到如何將開機順序優先選為CD-ROM，
下圖為進入的選擇畫面，請問該如何設定?麻煩大家解答，謝謝大家
Launch CSM [Always}
Launch PXE OPROM [Legacy]
Launch Video OPROM [Legacy]
Boot Priority Order
1st Boot Device [HL-DT-ST DVDRAM GHM...]
2nd Boot Device [WDC WD10EZEX-21M2NA....]
3rd Boot Device [Removable Device]
4th Boot Device [LAN]
Hard Disk Drive Priority [Press Enter]
Optical Disk Drive Priority [Press Enter]
Removable Disk Drive Priority [Press Enter]
Network Device Priority [Press Enter]
Boot Menu [Enabled]
D2D Recovery [Enabled]
Quiet Boot [Enabled]
Halt On [All, but keyboard]