I have a 1 year old dv9920us laptop that is refusing to boot into Windows Vista. The Vista "loading screen" appears, but the marquee doesn't and the laptop is perpetually stuck in this state. I was able to boot into live Linux and access my hard drive form there, so i am unsure as to what exactly the problem (Windows or hardware)

Hello,

Well if a linux live cd works fine i would say the hardware could very well be working. Did you try safe mode or are you unable to get into safemode?

Did you apply any updates or install any new software.