User-821857111 posted
What could be the possible cause?
Formatting the system changed the collating sequence?
Having never worked with Paradox, I don't know the answer to your question, but searching "paradox access collating sequence" in Google throws up some potential resolutions.
http://www.google.co.uk/search?hl=en&q=paradox+access+collating+sequence&btnG=Google+Search&meta=
Hint: you can usually find the answer to 80% of your questions by putting the
actual error message in Google.