I am unable to erase hard drive after a crash, also cannot reinstall Lion because disk is locked.  There seems to be nothing else to do, suggestions?  Where do I go from here?

I downloaded Lion 100 days ago (conveniently after the 90 day tech support)  now my HDD has crashed and it gets stuck at the apple screen.  I then hold command R and go to disc utility try to repair, that doesn't work, and try to erase.  But it says error, cannot unmount disk.  I then try to reload Lion, but it says the disk is locked.  Okay, so do I need a new hard drive?  If so that's fine, I just cannot seem to erase this drive to reinstall lion.  Also, I don't have a disk to reinstall OSx, as Lion is done via internet. 

Wow, thanks.  It did the trick.  So now I am confused, do you think I still need to take in my Mac to see if there are some problems with the hard drive, or do you think I'm in the clear.  I was going to get a new hard drive installed, because I thought that was the issue seeing as I couldn't access it during safe mode. 

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