This usually happens when the user's profile loses its association with the default internet browser. If you recently installed a different browser (Firefox, Chrome, etc) or set a different browser as the default, this can occur. Try these steps:

1. Open the Control Panel.
2. Open Default Programs (may be listed under the Programs section)
3. Click on "Set your default programs"
4. Click on Internet Explorer in the left pane to highlight it.
5. Click on "Set this program as the default"
6. Click OK.

Now see if she is able to open links. Once she is working properly, she should be able to then change the default to whichever browser she prefers.

Hope this helps.

-SW