Unable to install Lion due to unable to unmount disk

Need urgent help here.
I want to reformat my hard disk due to some reasons, and I tried pressing on Command-C while it boots up. Then I got into the Mac OS X Utilites, and then click on Disk Utility to erase my hard disk. Inside I have 1 hard disk named as Hitachi with a partition named Macintosh. I tried to erase the Hitachi one, but it says it couldn't unmount disk.
So I made a call to Apple and they told me to do a secured erase on my Macintosh HD Partition. Did that, and tried to install Lion to it, but I got this error.
"Could not find installation information for this machine. Contact AppleCare".
Anyone could help on this problem?
Coz I would need to wait for another 12 hrs or so before I could call to Apple.
Please help!!

But spotlight find it isn't it?

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