Len
First things first: when you copy an entire file to a notebook, no links will be updated/changed that previously existed in the file. This can hence cause a problem if the file contained links to another file (say on the previous computer's harddrive) as the file being targeted by the links may well not be on the new computer, or may be in a different location on the new computer.
If you think you may be suffering from this, you should be able to open up the copied file, and select menu Edit>Links and select the button "Change Source" to point the links at the new location/file.
Does this sound like this could be helpful to you?
Richard