I too am getting a 1603 error upon installation. I was prompted to update an otherwise perfectly good program when it hit the 1603 error same as everyone else. I have followed all the advice up to page 5 of this board. I have windows vista 32 bit. I have SP-2, i have the NET framework installed and turned on. i have tried making its own PDN folder outside of the program files, i have tried installing it in documents ( that is where i installed it in my laptop) I have done the Repair, i have done the installer cleanup. I did the chkdsk. all to no avail. Is there somewhere i could download the older version that worked? I even tried copying the older version from my laptop on a flashdrive and installing it , no luck. This was a GREAT program up till now. ANY HELP!!!!!