HP750C plus with Windows XP

Anybody experienced plotting anomalies between windows 2000 and XP with HP plotters? A recent CAD PC with AutoCAD 2002 on it, has been replaced with a machine
with XP on it. AutoCAD 2002 now prints colours much darker than before!!! Some darker colours are now black! I have tried printing direct from AutoCAD and creating a plt file and spooling it, same problem! When viewing the PLT file in SPLOT the colours look ok, and even print ok using SPLOT. Is this a plotter driver problem? Anyone with same experience/solution?
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