Good afternoon everybody on the platform I trust we are having a great day

I need some help from you guys. I was having a Windows 10 operating system on my computer and when I change the hard disk I install a new Windows 10 on the new hard disk and remove the old hard dick without formatting it or taking out any of my files.

When I inserted an Old hard disk that contains my file into the system I was able to view some of the files but not all. If I try to access any file on the Old hard disk which is now connected as an external storage device, my computer will run very slowly and when I try to copy, some things are not working in a request for permission which I did and it was not granted.

Is there any way I can send those files out before formatting my hard disk, that is the last thing that will come to my mind - formatting the hard disk when I have not copied out my files.

If anyone here can suggest to me programs or application that I can use or shortcut that I can apply to save my files and all my documents on the Old hard disc please help me.

I appreciate it in advance 🇳🇬👏