Windows 10: Will I have to reinstall Windows 10 if I enable Legacy Boot Mode in my laptop's BIOS?

So I want to enable Legacy Boot Mode to do something, but I don't know if enabling Legacy Boot Mode instead of UEFI will do anything to my current installation of Windows 10?

Will it be fine? Or will I have to reinstall the OS?


Thanks in advance.

:)

 

Unable to enable Secure Boot as UEFI BIOS is running in Legacy mode

I have Windows 10 Insider preview installed on a custom built PC with an ASUS M5A99X Evo R2.0 UEFI motherboard. The motherboard carries the Windows 8 ready logo, meaning it supports Secure Boot and has a UEFI BIOS.

When I installed Windows 10, I did not realise that the motherboard was actually running in Legacy Mode by default out of the box for the on-board devices i.e. the HDD, DVD USB are all running as traditional BIOS devices and not UEFI BIOS. Windows shows
that the BIOS is running in Legacy Mode and that Secure Boot is not supported.

If I go into the BIOS settings, I can see that the Secure Boot option
IS enabled, but Windows still shows that it is not supported. I tried changing the Boot devices to prioritise UEFI drivers first and reinstalled Windows (as a clean install is required if you want to enable Secure Boot), however Secure Boot was still
not enabled and Windows still it shows as the BIOS as running in Legacy mode. I then tried switching off Compatibility mode within the BIOS settings, however after doing this no boot devices were detected, so I could not attempt to install Windows 10 again,
either from USB or DVD.

Switching the compatibility mode back on allowed me to boot back into Windows.

I cannot find a way of turning off Compatibility Mode in the BIOS and still having boot devices available to install Windows from.

I have tried everything I can think of to get this working, but without success. I would like to have Secure Boot enabled as it is a important security measure and the reason why I purchased the motherboard I did when building my PC.

Please do not copy and paste replies asking me to disable my antivirus etc. or check for malware, then mark my question as Answered, as the Microsoft "helper" bots normally do!


Thanks!

 

UEFI vs Legacy boot mode

I just found out I'm running at "Legacy" boot mode.
Are there any downsides running my Skylake system in "Legacy" boot mode?

I don't really want to reinstall windows.
Also I have no problems with my SSD, speeds are as they should be.

Just booting up my system takes some time, maybe it just would be faster booting with UEFI?
My Asus Gaming laptop is booting up faster.
If thats the main difference *Oh Well hwell:

 

Difficulty setting BIOS to boot in Legacy mode

I tried all that is suggested by HP but it makes no difference, the Legacy mode simply refuses to stay put. I always ensure that the settings are confirmed before exiting the Setup but that's just it ... the machine always goes back to Secure Mode. Annoyingly,
prior to the iOmega software being installed and the consequential failure to boot, I could set the PC to boot into Legacy mode with no problem if I chose to.