Can't locate files or programs on my old hard drive

I could not upgrade my Dell Inspiron 660 Desktop to Windows 11.

I purchased a GeeKom Mini with Windows 11. I also bought an ORICO docking station.

I removed the old HD and hooked it to the GeeKom via the docking station.

The GeeKom shows the old drive and reads it, however, I can't find my Microsoft Office 2007 or any of my documents on the old desk top.

In addition, I don't see my PDF docs on the old desktop, nor the Brother control center with all of my scanned documents from the past ten years.

Please understand I am not in the least technically oriented and almost 80 years old, so please try to advise me in the simplest way possible

Thanks