That is weird. (my 660 and 1120 were parallel port and 952 usb port)I went thru everything piece by piece til I found the printer was causing the problem. I havent had any trouble since. Maybe with the combination of the other hardware I have is different. dont ask me why LOL I have found that the computer has a mind of its own when it comes to stuff like this. I am just happy I have no more problems since removing the HP printers. Dont get me wrong I love HP printers but they would just not work for me when I had poser and them installed.