Password to print

Got a wierd one. I moved a shared printer (an HP Officejet G55xi all-in-one)
from one PC to another. I added the printer to the new PC and shared it.
However, if someone tries to add the printer by browsing the network, when
they select the printer the bottom part of the window shows "Access denied".
If you double-click on the printer, a Username/Password dialogue box pops up.
I have tried entering my username (password is blank) and get a dialog box
saying I don't have access to the PC.

We have 4 PCs with 3 printers on the network, and this is the only
PC/printer it happens with. Also, possibly a symptom, if I look at the
Printer properties, I have a Security tab. None of the other PCs have it on
their shared printers.

The printer works fine locally, and is using the most current drivers. I
have verified that Everyone has Full Access to the spool\printer folder.
Also, the PC that HAD this printer got a new laser printer. I shared it as
usual, and it works perfectly.

I am stumped. Thanks for any advice.
--
Computers are not intelligent. They just think they are.