The key to repairing bad credit is to write a properly formatted letter of dispute to one or all of the credit bureaus and send them out via registered mail.
Here's a step-by-step guide to writing a letter of dispute to get rid of those black marks off your credit report for good.
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http://www.youtube.com/watch?v=lPdscX9uL38
click more info on description and you can see a link to this site (instructables.com)