I have an IntelliStation Z Pro 6221, with dual Xeons, and I have installed 8 GB - more than the current XP Pro will recognise, but then sitting in the optical drive is an official Win7 64-bit DVD. Ready to be installed ! Too bad I cannot get the 6221 to even understand it is there. I changed the Setup to boot from the CD/DVD first, and in fact during the XP Pro boot sequence, I get a quick question asking if I want to do that. You have to be quick, but I hit the "any" key. Trouble is, the drive light came on before the question, and never after, as it continued to boot XP Pro. Running SETUP from the DVD is not accepted by the machine. Any suggestions would be MOST welcome, especially if they work ! I will be so grateful I will tell you about something that may prove of interest. (Holds breath....)
Latest news is that I am told this cannot be done, I have to format the C: drive, and install Win7-64 new. Has anyone done this ? If the 32-bit OS won't recognise a 64-bit SETUP.EXE, I have zero confidence that the BIOS alone will recognise the DVD and run the installation.