That means that you downloaded the 64-bit version of Vista. It will not run
in Windows XP x86, because a 32-bit operating system can not do anything
with a 64-bit application. You can not upgrade to x64. You must boot from
the DVD and then, during the installation process, tell it to install on the
NTFS partition that I am sure you have made, right after backing up your
files. If you don't have a separate partition or separate hard drive (and
no, an external will not work either) then it will write over your current
operating system and there is no way to unwind that back to XP. Are you
sure you are ready for this?
When I popped the DVD+R into my DVD drive, I went to My Computer and clicked
on the drive. The file was called "LB2Cx_FRE_EN_DVD". I clicked on that file
and a message popped up saying "This Is Not a Valid Win32 Application". What
does this mean?