Never advise anyone to switch to XP 64bit. Just avoid that. XP 32bit, Server, Win7, Linux Mint LXDE, but not XP64. That OS is like an Abandonware poster-child.
Also... Has it occured to you that millions of people are still using 32bit hardware? Look at the date on this message, scary isn't it? But it's true.
Back to topic: I found (& Necrobumped) this because I am interested in establishing a RAM-drive for security and also because the Win8 USB system degrades heavily when running from non-USB3.0 devices. I may try a Bart PE, Win PE, or Tiny XP distro booted from USB to RAMdrive next.
It's a recovery thing. Linux is great, but sometimes XP would be better and current USB distros I've found rely completely on USB flash.