Cant boot my win 7drive

[Yankee delta]

Hye my ante bought a new pc a medion akoya p62020(md 34100) but she wanted her old drive whit win 7.

I alraddy tried the bios but I cant find the option to boot from it plus where to set ufeui to legacy. Please help if I said to here you need to learn win10 im stuxk here for the rest of my live.

[TheWiseGuy]

I assume you replaced the current hard drive with the one you want to use?

[Yankee delta]

Nope wont boot on its own then I heard the mobo had to be on legacy but cant find how