Print Issues

I have a couple of issues...I'm running V7 (7.0.0007) Pro on Windows xpI seem to not be able to adjust line thickness.no matter what i set it at they are very very thin.I'm plotting to a HP laserjet using a hpgl driver.any suggestions??Does anyone know of a Driver that would allow me to plot to a Xerox Document Centre 470ST?Thanks in advance-Jeff Hall