Can anyone tell me if it's normal to get kernell32 errors while runing access!?

The problem is the following:

I have a database that calculates based on its records, various statistical data, and like Normal Distribution, reliability percentage, etc.
and shows the results on the form, (the form is divided by tabs) with grafics. In the begining i use 1 single form to add records and a subform to retrieve the results. When i try to view the results by opening the main form i get kernell32 error and Access shutdown, when i open the subform first, then close it and then open the main form, no kernell error ocurs. So i decided to use two forms, but sometimes i got kernell error and sometimes no.

I am using Windows 98 Me.

Can you tell me why this is happening!?