Problem earsing HD and reinstalling Lion

Hi,
I've tried to earse my HD and reinstall lion,
pressed command-R on startup and in disk-utility tried to earse.
It bring an error: "Couldn't unmount disk".
Then I've earsed the partition it had successfuly and tried to install Lion.
but when I need to choose HD, the one from before is marked as locked.
I tried to set a partition in the HD and the same error accures: "Couldn't unmount disk".
Help please,
Thanks!

I believe your problem is that you are trying to use the copy of Disk Utilities that is on your Macbook Pro's harddrive to erase the same harddrive. You cannot do that. You have to use either the original CD of your OS to boot from and use the copy of Disk Utilities on that or you can boot from an external harddrive that contains a bootable copy of your current OS and use the copy of Disk Utility from there.
Hope this helps

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Hello to all,
I'm a Student of Informatic Engineering studiying at UCAB in Venezuela.
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I'm Sorry for any misspelled word, English is not my main Language.
MacBook Pro 13" (Late 2011)
Specs:
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Problem earsing HD and reinstalling Lion

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