MacBook froze, can't get it to work again

My MacBook half-froze - I could move the cursor but couldn't click on anything, none of the keys would work either - so I shut it down by holding down the power button.
When I turned it back on, there was a grey screen with 4 options: restore using Time Machine, reinstall Lion, get help on safari, or repair using disk utility. I tried repairing, but it said nothing was wrong. I tried reinstalling Lion, and after waiting an hour and a half for it to install and reboot, the same grey screen with the same 4 options appeared.
Does anyone have any idea what this is and how I can fix it? I can't restore because I don't have time machine.

it sounds like the mac keeps booting to recovery partition.
do you have backup of your data? if you do i would recommend opening that disk utility again and choosing the mac HD from the left side
go to the erase tab and make sure it's in mac OS extended journaled format then click on Erase button
close the disk utility window and do a clean install of the OS by following the prompts.
you should then be able to restart and go through the setup assistant

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MacBook froze, can't get it to work again

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