It all started when my yt seemed to be experiencing a malfunction of sorts: it couldn't play in HD (480p fine, but not 720p or 1080p). I didn't know what to do, and made a thread here that no one responded to. Now, I realize that when I use firefox, my blip doesn't work at all, and when I try and play yt on HD there, Adobe crashes. So yeah, something's wrong and I need help: I used antispyware last night and got rid of some adware, and I just used malwarebytes and found nothing bad there. The FAQ on yt didn't get me anywhere, and I'm not sure if or how/where to uninstall and reinstall flash if I need to. I need help; please respond with any ideas.
ONE MORE THING TO ADD: Netflix is fine, so nothing wrong with Silverlight. Dailymotion runs good too.