how to reset bootloader

[Soogs]

I installed ubuntu to an external drive and now when the drive isn't present at boot I can't access windows without hitting f12 in time...

I'm using a USB/HDMI switch and it doesn't always register quick enough if I need the kb at boot and I don't think I'm going to keep the ubuntu installation... whats the best way to get windows back as the default/only os?

thanks in advance

 

[Soogs]

thanks, I totally forgot about MSConfig
I've had a look and can only see Windows 10 and its default.
I've wiped the external disk ubuntu was on.... not sure if that had to be present when I tried MSConfig?

 

[Soogs]

there's a blast from the past... haven't used this app since the XP days
EasyBCD also only sees one OS option.
I think I might need to poke about in my bios and see what's happening there.
if I don't hit f12 fast enough it just boots to some command line