I think it is because you are creating a statement
with the following parameters and I have a feeling
that MS Access is not supporting this operation..

ResultSet.TYPE_SCROLL_INSENSITIVE,
ResultSet.CONCUR_UPDATABLE

To test this make your

Stat=Con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,
ResultSet.CONCUR_UPDATABLE);

to

Stat=Con.createStatement();

Note may not be able to go to previous  ResultSet value