We have a new Dell running Vista 64 bit. We have an HP plotter that does not have a Vista driver available from HP. I asked a question about this before and we purchased a Winline driver for this plotter as a result of that question. The driver is not working correctly. It does not print in color and it prints very slowly. We have been in touch with Winline and Autocad (the software that is printing slowly) and can not seem to solve the problem. We have had a service call on the plotter and it is Ok. I am looking for any suggestions on speeding up the printing and correcting color problems or do we need to change operating system on workstation to XP Pro and if so what potential problems will we have with that?