Partial Printing of Documents

I have a Compaq IPAC1 PC running Windows 2000 that is connected to a stand-alone HP 950C printer and also a network Ikon printer. When trying to print documents to either of these printers, either the documents do not
print or about half the document prints and then stops. The only error message received has been: Virtual Memory is low. This has been increased but the problem persists off and on. Other office members have not encountered any problems either with their stand-alone printers or the network printer. Any suggestions to correct this?