Many thanks for your suggestions. I have no P4 or P5 runtime installed manually. When I tried to upgrade Windows to SP2, the attempt failed and I had to use System Restore to get the display screen back to normal. As suggested by CL P6 FAQs, I have reduced the Hardware Acceleration by 2 notches and upgraded my video card but this has made no difference. I still have the same lock-up and printing problems as before. I am contacting CL support to see if they can possibly assist