Two points: As Vino pointed out, you'll definitely need a cosigner with good credit.
Also, if you've ever defaulted on student loans, you will likely not be able to secure them, cosigner or not. If student loans play no part in your bad credit, you might be ok.
There are some institutions that won't lend to anyone sub-500 though, so make sure you shop around before applying. You don't want inquiries from lenders dragging down your score even more.