I have developed an Application with Access 2003. I would to give the trial version out but it should automatically go of within 90 days and request for registration. I need help to solve this issue.

First Access is not very secure. Second, I'm not a fan of timed trials. The way I handle it is to limit the number of records that the main table can handle. In the Before Insert event of the form use code like:

If Dcount("*","Tablename") >10 Then
MsgBox "Trial version cannot exceed 10 records. Please register", VbOKOnly
Me.Undo
End If