Installed a hard drive with Windows 10 on it into a computer that had Windows 7 and it is now asking for a boot disk.

[zq8blazer]

I had a spare hard drive with Windows 10 on it that had just been turned on once then removed from the laptop. I installed it into a laptop that had Windows 7 on it and it is now asking for a boot disk so what do I do?

 

[USAFRet]

I had a spare hard drive with Windows 10 on it that had just been turned on once then removed from the laptop. I installed it into a laptop that had Windows 7 on it and it is now asking for a boot disk so what do I do?

Moving a drive with an OS on it often does not work when trying to boot this new OS.

 

[zq8blazer]

Okay so I'll need to format the drive and then install it? What I do about Windows?

 

[USAFRet]

Okay so I'll need to format the drive and then install it? What I do about Windows?

Is this a new PC? Then you need to purchase an OS for this new PC.

 

[zq8blazer]

no, the hard drive is going into an older laptop.

 

[USAFRet]

no, the hard drive is going into an older laptop.

What OS originally came with this older laptop?

 

[zq8blazer]

It originally had 7 on it, but before the hard drive went bad it had 10 installed.

 

[USAFRet]

Windows 7

Then it may be stuck with Win 7. The free upgrade period ran out in July.

So, it's not booting.
That means a reinstall of the OS.
For a Win 7 install, use what it came with.
For a Win 10 install, that would require a Win 10 license.