Windows 7 worked fine and now won't boot/start anymore?

My little brother just bought a used 24" iMac (early 2008) at the beginning of this year.
He installed a Boot Camp and Windows 7 for gaming.
Everything worked fine and he played with iMac earlier today, but now he phoned me that Windows won't start anymore. He gets a black screen with blinking line after booting to Windows partition. He said that the black screen used to flash everytime windows started, but now he's stuck to that black screen. He tried to repair windows with the installation DVD, but there was only options to restore system from backup image file or drive, which (of course) my brother hadn't made.
Is there any way to fix this problem or does he have to install Windows again?

Get a book. Spend more time researching. Make sure not to install x-ware or anything that isn't needed and compatible. You should invest in backups, and use restore check points.
Try getting chkdsk to also look for bad sectors.
And uninstall whatever was last installed. And one plus for Windows, you can rollback a driver too.
Could happen if they ran too low on free disk space. Windows 7 SP1 is due out, and that will need 9GB of free space to install and update (you get some back but good idea to have the extra space).
Clean out all the temp files that can clog a drive, I use CCleaner daily and sometimes there is 500MB to dump.
A good backup/clone and Boot Camp support program:
http://www.paragon-software.com/home/hdm-personal/

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