Print server acting strangely

Recently i’ve a problem with one of my network printer, it’s a HP1125C, when i installed on some win98 PC, it can print smoothly, but not when i installed on some NT or 2000 machines. Another thing is sometimes the whole printer list in my print server dissappear totally, so i’ve to restart the server to restore the printing. When i checked the Event Viewer, it records two errors, one is ” The server service was unable to map. Error code 1722. Another one is “WMI ADAP is unable to load winspool.drv”. Please Help!!