>Do I do this with the Reindex command?

Yes. If that doesn't fix the problem, and if you're using compound structural indexes (.CDX), then you can DELETE TAG ALL and rebuild the index tags one by one using the INDEX command. Caution: be sure you have a record of all the index expressions written down somewhere before you do this. If VFP is not installed on the customer's machine then you'll have to write a little program to do this and build an EXE to run on the customer's machine.