In order to copy files from a HDD from another system, you must take ownership and
get full control access permissions for your user account or group for each of the file/folders you want to copy over. Additionally, I suspect that the files/folders you want to copy could have the hidden attribute active. How to Take Ownership and Gain Full Control Permissions in Windows
from My Digital Life has a very good write up. Shows you how to get control of the files through Windows, command prompt, or with a script.
Once you have ownership and full control, if you still can't see the files/folders you want then try the attrib command at an elevated command prompt to view and change the hidden attribute of the K drive Documents and Settings folder. Attrib command has an /s switch for processing files in current folder and subfolders, and /d switch that processes folders well. Try something like attrib -h K:\"documents and settings"\*.* /d /s
Hope this helps