Hi,

Using conditional formatting you can do this.

Follow below steps.

1. Double click on the "choose the problem " check box.
2. Click on "Display" tab.
3. Click on "Conditional formatting".
4. Click on "Add" button.
5. In the first drop down select "No problem" check box field and slect
"equal to" option in second drop down and select "True" or "false" value(i.e,
you need to select value you set "value when checked" in "No Problem" check
box properties.
6. check the "Disable this controle" check box.
6. Click on "Ok" until you close the properties wizard.

Now it will work what you want.
You need to do vice-versa if you want disable "No problem" check when we
select " choose the problem" check box.