I have been working with this database for about 6 months. I set the Index on the primary key to a value of Yes(no dupicates) I use SSN# as identifer. This has work fine. I could not enter the same SSN# without an error. My computer was hit with a power surge and the power supply was replaced. I don't know if this has anything to do with my problem. But now I can not get this function to work. I can type in duplicate values (same ssn) and the Yes (No duplicates) is set. Is there something that I am doing wrong. Thanks for any help you can offer.