I have a Mac Pro 2008 2.8 GHZ Quad Core. I just successfully installed Windows XP (had to reformat) and I am trying to upgrade to Windows 7. I have a full installation legit copy of Windows 7 64 bit and XP. I selected the Windows 7 disk via holding option upon restart, but it's booting into the XP Bootcamp partition. I don't remember how I got Windows 7 on my computer before, but I vaguely remember upgrading from XP to 7 after reformatting it. Any ideas on how to fix this? (UPDATE) I just went into Boot Camp Assistant and clicked "Install Using Single Partition (Windows 7)". It erased the partition and made it FAT32. While in the installation window after booting into it from the disc, I was able to select "format" and it finally allowed me to install the OS onto the HD. I think I'm okay now. It's so frustrating how many steps need to be taken to install a simple OS!