Disc repair error "couldn't unmount disc"

Hello alll! I would very much appreciate any help from anyone!
A few days ago I had reason to believe that I got a virus on my Macbook Pro. My hard drive might have been corrupted. I was unable to turn on my MacBook, with the screen frozen on the opening apple logo for hours. Not being tech-savvy in the slightest, I decided to simply erase my "Macintosh HD" disc in Disk Utility (restarting computer, holding down alt key) and then restore my Macbook with a recent back up that I have on an external hard drive. After erasing my disc, when I try to restore with my backup, my "Macintosh HD" disc doesn't appear. Only the "Repair HD" disk appears. I tried to repair my "Macintosh HD" disk in Disk Utility, but recieved an error message "couldn't unmount disc". What can I do to fix this? A friend told me it could be a hardware problem, perhaps a wire or something is out of place. What do you guys think?
Any help would be greatly appreciated!

My macbook air (OS x lion ) hard disk got crashed. now it starts with a grey screen and MAC OS X utilities. in the disk utility, the hard disk icon became inactive. when i erased the disk it became active again but i am still not able to partition it. it showed -- "Partition Error". "Couldn't unmount disk". now the disk icon became inactive again. when i click on mount it becomes active again but partioning is not done after many attempts.
another problem: - when it I click to proceed with the installation (still unpartitioned) it verifies my macbook's eligibility and says that the machine information is not with apple. below are the screenshots.
is there any internet issue, i got connected on my institute's wi-fi (excellent speed- 54mbps)

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