How can I establish credit quickly?

It doesn't matter at all if your parents having bad credit only the thing matter it's your parent credit history. I suggest you go with Loan Consolidation, if your parent are ready to cosign then you can get a loan with you parent bad credit also, there are many on-line sources who provide loan consolidation service for people have any credit situation, for your reference http://www.ezconsolidation.com my one of friend had recently get an loan with cosigner with bad credit, you can try this source may this could help you.