How to Install Windows 10 from a Dell Windows 10 DVD
Look in BIOS , if shipped with W7 it is most likely in Legacy mode
1. Boot from the DVD (F12 Menu) (Legacy Option > DVD)
Note: You may experience a delay (1 to 5 minutes) to boot to the Dell Screen with Spinning Circles.
2. Choose English
3. Choose US
4. Choose Troubleshoot
5. Choose Advanced
6. Choose Command prompt
7. In the Command Prompt Window, enter the Command: "diskpart" > Enter
8. Next Command: "list disk"
9. Then: "select disk 0" (0 being the hard drive where the OS should be installed if there are multiple drives)
10. Type "clean"
11. Type "convert GPT"
12. Type "exit" (2 times)
13. Power down the System
14. Restart the system tapping F2 for the BIOS
15. Change the Boot List Option from Legacy to UEFI with Legacy Option ROMS "Enabled"
16. Navigate to Exit and "Exit Saving Changes"
17. Reboot F12
18. Choose UEFI DVD boot option
19. Dell Screen
20. Note: You may experience a delay (1 to 5 minutes) to boot to the Dell Screen with Spinning Circles.
21. Choose English
22. Choose US
23. Choose Troubleshoot
24. Choose Recover from a drive
25. Choose either "Just remove my files" or "Fully clean drive "
26. Dell screen - will show recovering this PC XX%
27. Reboots to W10 when finished