I run windows XP home and recently had to do a clean reinstall. After the install I tried to reinstall both of the printers that I had installed prior to the crash. ( namely a Lexmark x74-x75 all-in-one and a Hp photsmart 7450 photo printer). I had no issues with either prior to this reinstall of Windows. Now I can install either one individually and they will work but as soon as I install the other one I get error messages that they will not communicate with the computer. If I uninstall one of them then the other one will work again. I have tried installing Lexmark first then HP and also HP then Lexmark but it makes no difference. What is the problem??