Reg. Row and Column

I didnt mean that any row has been hidden. the bar of Row & Column which we used to insert to resize th column and other formatting has been hidden and not showing in particular sheet. 

attach ur sheet here,,may be u have applied the option filter or freeze.

this is simple click on the VIEW tab

in that see that the box beside "Headings" has a tick. Hope this solves ur problem.

But i did not understand why ur question starts with " reg. ____ " what that means ?