Statute of Limitations and question about judgment

My question is about statute of limitations and collections. I found something online saying that it is 4 years for a judgemnt in my state. Well the debt has been over 4 years so as I understand the original creditor or any collection agency can not sue for the amount. The bill was from 2000 and went unpaid as of very late 2000 or early 2001 but on the credit reports it says 2002 and again 2006 payments were made, they were not. ACS is the 4th collection agency that has had their hands on this so it seems to keep getting validated. I'm afraid at this point that they will never get it off my credit report. I was hoping this would drop off as of next year or 2008 but it appears not. Any ideas? Besides paying...I can't. Can't do debt mgmt as I'm already in that with the toher bills ex hubby left me with. This bill and another that another collection compnay calls on is his too. He's in the military and overseas so can't be reached so they harrass me instead. I'm tired of ACS being rude too. thanks KIM