Solved 'Disk checking' endless loop

Hello. I'm new here (obviously), so thanks in advance for taking the time to read my post. Dell XPS 12 running Win8 x64. Had it for about six weeks, and I had two problems I with it: - every so often (maybe once a week), when I would turn it on, instead of booting into my normal startup screen, it would say 'Preparing Windows', then boot into, like, a generic account with none of my...