I have shared a network printer from my Windows 8.1 machine for an old XP machine to print to. (Don't get me started on why the owners still need an XP machine) Worked fine for ages until I upgraded to Windows 10. The XP machine can see and access shared folders on the same Win 10 PC without any changes being made (logged in under basic USER group) and can see the shared printer but cannot print to it. I have the network wide open, full permissions set for it, security turned off and still...nothing. I was getting the following message "You do not have sufficient access to your computer to connect to the selected printer." So when I logged onto the XP machine as an administrator I was able to access printer preferences but still would not print. I received the following message "A StartDocPrinter call was not issued." It seems that somewhere the Win 10 machine is still blocking access. Any ideas?