Just bought a WD My Passport Essential 500GB portable hard drive to back up my Dell Dimension E310 desktop, Pentium 4, 2 GB RAM, running Win XP Pro, SP3; 2 . Internal HD is original Maxtor SATA 80GB with about 13GB free. Clicked on ‘Install WD Smartware’, agreed to EULA, and installation starts. At about the ‘3 minutes remaining’ mark, I get an error box - “Installation was not successful (Error Code: 1603) Please try again or contact WD support for assistance.”