When printing with watermark or embeded picture puts vertical black lines on right of page in line with text and picture. driver file ZIMFDRV.DLL HP's latest. Another system XP Pro same printer (Laserjet 1020), driver file IMFNT5.DLL (older driver) prints fine. How do I completely remove the new driver so I can reinstall the original one from CD?. I have tried new driver in printer properties but this does not work. I have tried deleting the Dll files but when redetecting the 1020 it wants the ZIMFDRV.DLL file.