The best way to handle these types of information lines on your credit report is to dispute them but you have to remember that if that isn't done correctly, it is like kicking a hornets nest. Just calling them and saying, "hey, I dispute this." is NOT good enough, regardless of what ANYONE says. It has to be done with a certified, return receipt letter that has been properly worded to prevent the sleezy little buggers from using a loophole. You can find a lot of information out there about how to do this on sites from people like Dave Ramsey or with self help books like Weathering Debt (either one works, but I prefer Weathering Debt, it was much more concise and to the point) but whatever you do, DON'T try to wing it and don't pay someone to do something you can do yourself with ease and for free. Besides, you need to know how to stop the problem from happening again, right?
It's important to note that repairing bad credit is a bit like losing weight: It takes time and there is no quick way to fix a credit score. In fact, out of all of the ways to improve a credit score, quick-fix efforts are the most likely to backfire, so beware of any advice that claims to improve your credit score fast. The best advice for rebuilding credit is to manage it responsibly over time. If you haven't done that, then you need to repair your credit history before you see credit score improvement. The following tips will help you with that. They are divided into categories based on the data used to calculate your credit score.