Cannot boot into Windows Vista, only thing changed was Adobe Flash Player

Hey guys,

My dad bought an HP laptop around 2 months ago, and everything had been working fine. My brother and I were attempting to connect to my dad's DirectTV DVR in order to use PlayOn to watch Hulu. I tried to watch an episode of Conan Obrien, when I get the error that I must uninstall and reinstall adobe flash player and restart PlayOn. I did so and to no avail, so I restarted the laptop which resulted in and constant boot. Right now I turned it on at 2am and it is still booting now (11 hours). We cannot use a boot disk or anything, it does not seem to recognize the hard drive. Any help would be appreciated. :cry