It sounds like that command is trying to access the spooler service on the other machine, and that isn't going to work unless you have permissions to do that. Easiest way to do that is to have both machines on the same domain and set the remote permissions appropriately; I'm pretty sure it would be possible to do this in a workgroup, but you'd have to use trickery to do it (e.g. have the same username and password on both machines and use that account to do the test).