Windows 8 wont boot after windows update

I have a dell xps 8500 that passed the upgrade assistant. So I decided a 2 weeks ago to upgrade windows 7 to 8. Everything ran great until this past wednesday when i restarted my computer for windows update. It restarted twice giving the error code

0xc000021a. Then it tries to automatically repair. That fails and then I'm on a screen that says troubleshoot or shutdown pc. Under troubleshoot I click refresh pc and am told my hard drive is locked. Resetting does not work either, a required drive or partition

is missing. So I click on advanced options and try restoring, this says I need to specify which operating system I am restoring. I didnt keep windows 7 so i dont know what this means. Called microsoft support and we downloaded windows 8 on my laptop which

is running windows 7 and burned a dvd to just do a clean install. We select custom install but windows does not see my hard drive. He has me run dell diagnostics and everything passed. Tier 2 support is suppose to call me back but If anybody has any answers

for me I would like to try to get it fixed myself. They were suppose to call me at 11am friday but didnt call till 2:30 when i was leaving for work. The guy said something about trying to type something at the command prompt, but I didnt have time. Any suggestions

would be appreciated.

Thanks

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