Is it possible to replace XP x64 with the old 32 bit version.  I bought a new dell precision 380 with x64 and eveything is great, except one must have application.  (A soil erosion app written years ago by people now dead)  I tried to install XP Pro but it fails and gives a BSOD.  I assume it depends on your system, but am not sure.  My processor is a Pentium D 830.