Problem during win 7 installation by USB. help!!!!

i have dell studio 1458.320gb hdd.
i always install win 7 on my laptop with bootable usb.
but this time after formatting c drive when i pressed "next" to continue setup i got this message.
"unable to create new system partition or locate existing system partition .please see setup log for more info."
i deleted c drive created it again but no luck.i have c drive of 35 gb and 2nd partition of 264 gb but i cant delete 2nd partition because i dont have anything to backup all my data,..
now that i formatted my c drive i cant do anything .my dvd drive is not working so i have no option but to use bootable usb.
so help me!!!!!.


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