Nah it's not a booting issue perse' . I work for Sony, but prefer linux on most things and was just curious. I hook up the USB drive, bios is set properly, it starts to load the disk, but then just stays on a black screen. One of the distro's i tried, just kept flickering, so seemed like a video issue or something.
Which is why I tried so many. I do repairs at a Sony Style store and we are generally rather slow, so I toy around with stuff I probably shouldn't, but general knowlege = fun. =)
Okay, maybe try this distro - it is installed as a single file on your windows partition, you just need to have enuf space for it to fit (DISCLAIMER: I have never tried it - so I don't know what *could* happen. back up first!):
or the ever popular wubi