I have a dell insiprion and I am trying to upgrade to windows 10 and it works good through the download process then when it starts installing it, the computer makes a noise sounding like a fan then a few seconds later it just turns of... No warning or anything... Also when I start it up some times it says "failure hard disk drive" or something on the pines of that but other times it starts right up... I desperately need help, please

Thank you.