I already have windows 8 installed in my laptop I bought about a month ago. The usual "update and shut down" option turned up and I clicked on it. It said "this app is preventing from shutting down". It always comes that way..so I clicked cancel this time. Nothing happened after that. All I got is a blank screen. It wouldn't shut down. After restarting, automatic repair started with the result "couldn't solve" and error "0xc000021a". All I can find online is people trying to upgrade from other OS. I tried restoring which dint finish even after like an hour. The last time I restored it finished in like 15 mins. I tried refreshing. It finished but it came back to the "advanced options" menu again. I'm trying to recover now using the DVDs which have the recovery media. What has happened to it? Is recovery the right option?