SHared Printer has message: Unable to connect"

I have a DI-624 D-Link router with several computer. I was ablle to make my
USB-connected LEXMARK X1185 printer a shared printer. It is connected to the
USB port on my DELL desktop.

After a couple of minutes, when I check the Properties for it from another
computer (my GATEWAY PC), I receive the follwoing message: "Printer
properties cannot be displayed. The print spooler service is not running".

If I try to open the printer queue, it shows the printer name with a message
"Unable to connect".

What did I do wrong? Why can't I maintain a connection to the shared printer
from other computers on the newtrok?

Please advise.
Thanks.
Tony V